Cooking science guides
Deep dives into the questions every cook asks: why cakes sink, whether marinades work, what salt really does.
Baking
Baking Soda vs Baking Powder: What's the Difference?
Baking soda vs baking powder: soda is a pure base that needs an acid to fizz, powder brings its own acid. Learn when to use each, how to…
📘 7 min readWhat Does Kneading Actually Do to Dough?
What does kneading do to dough? It stretches and aligns flour proteins into a gluten network that traps gas. Learn how long to knead and…
📘 7 min readWhy Did My Cake Sink in the Middle?
Why did my cake sink in the middle? Usually it rose before its structure set. Learn the real causes, from underbaking to extra…
📘 7 min readWhy Do My Cookies Spread So Much?
Why do cookies spread? It's a race between melting butter and setting dough. Learn how fat, sugar, flour, soda and oven heat decide flat…
📘 7 min readWhy Does Bread Go Stale?
Why does bread go stale? It is not just drying out: starch recrystallises and firms the crumb. Learn why the fridge makes it worse and…
📘 7 min readWhy Does Cold Butter Make Flaky Pastry?
Why does cold butter make flaky pastry? Solid butter flakes melt late and release steam that puffs dough into layers. Here's the science…
Eggs
How Do Egg Whites Turn Into Meringue?
Egg whites turn into meringue when whisking unfolds their proteins into a net around air bubbles. Learn why fat ruins it, when to add…
📘 7 min readWhy Are Some Boiled Eggs So Hard to Peel? (And the Green Ring)
Hard-to-peel boiled eggs are usually too fresh: their acidic whites glue to the shell membrane. Here's the science, plus what causes the…
📘 7 min readWhy Do Scrambled Eggs Get Rubbery?
Rubbery scrambled eggs come from overheated egg proteins that squeeze out their water. Learn the temperatures, timing and tricks for…
📘 7 min readWhy Does Custard Curdle?
Custard curdles when egg proteins overheat, bond too tightly and squeeze out liquid. Learn the safe temperature zone, how to prevent it…
Emulsions sauces
How Do Emulsions Work? Mayo, Vinaigrette and Beyond
How emulsions work: why oil and water refuse to mix, how egg yolk and mustard hold them together, and the science behind creamy mayo and…
📘 8 min readHow Does Flour (or Cornstarch) Thicken a Sauce?
How flour and cornstarch thicken a sauce: starch granules swell and burst in hot liquid. Roux vs slurry, how much to use, and why sauces…
📘 8 min readWhy Did My Sauce Split (and How Do I Fix It)?
Why sauces split: too much heat, fat added too fast or too little water. How to fix broken hollandaise, mayo, beurre blanc and greasy…
📘 7 min readWhy Does Cheese Sauce Go Grainy or Stringy?
Cheese sauce goes grainy when heat tightens casein proteins and squeezes out fat. Learn why, which cheeses melt best and how sodium…
📘 8 min readWhy Does Milk or Cream Curdle in Sauce?
Milk and cream curdle in sauce when acid, heat or salt make casein proteins clump. Learn why heavy cream survives a boil and how to…
Fermentation
How Does a Sourdough Starter Work?
How a sourdough starter works: wild yeast makes the gas, lactic acid bacteria make the tang and acidity, and every feeding resets the…
📘 7 min readHow Does Milk Turn Into Yogurt?
How milk turns into yogurt: bacteria turn lactose into lactic acid, the falling pH makes casein clump into a gel, and heating the milk…
📘 7 min readHow Does Sauerkraut Ferment? Lacto-Fermentation Explained
How sauerkraut ferments: salt draws out brine, lactic acid bacteria on the cabbage turn its sugars into acid, and a relay of microbes…
📘 8 min readHow Does Yeast Make Bread Rise?
How does yeast make bread rise? Yeast eats sugars and releases carbon dioxide, which gluten traps like tiny balloons. Learn the…
Flavour
What Is Umami? The Fifth Taste Explained
What is umami? It's the savoury fifth taste in broth, parmesan and tomatoes. Learn how glutamate triggers it, why pairs multiply it and…
📘 8 min readWhy Are Chilli Peppers Hot (and How Do You Cool the Burn)?
Why are chilli peppers hot? Capsaicin tricks your heat sensors into feeling a burn that isn't there. Learn why water fails, why milk…
📘 7 min readWhy Does a Squeeze of Lemon Make Food Taste Better?
Why does lemon make food taste better? Acid adds sour contrast, balances fat and sweetness and wakes up your palate. Learn which acid to…
📘 7 min readWhy Does Food Taste Bland When You Have a Cold?
Why does food taste bland when you have a cold? A blocked nose stops aroma reaching your smell receptors, and most of flavour is smell.…
📘 7 min readWhy Does Salt Make Food Taste Better?
Why does salt make food taste better? It adds a pleasant taste and turns down bitterness so sweet and savoury flavours shine. Here's the…
📘 8 min readWhy Should You Toast or Bloom Spices?
Why toast spices? Dry heat builds new roasted flavours and hot oil carries fat-soluble aromas through a dish. Learn to toast, bloom and…
Food safety
Is It Safe to Reheat Rice?
Is it safe to reheat rice? Yes, if you cooled it fast and refrigerated it. Rice left warm can grow Bacillus cereus, whose toxin survives…
📘 7 min readShould You Wash Raw Chicken?
Should you wash raw chicken? No. Rinsing won't make it safe; it splashes Salmonella and Campylobacter around your sink. Cooking to 74°C…
📘 7 min readWhat Is the Temperature Danger Zone?
The temperature danger zone is 4 to 60°C (40 to 140°F), where bacteria in food multiply fastest. Learn the 2-hour rule, safe cooling and…
📘 7 min readWhy Shouldn't You Thaw Meat on the Counter?
Why you shouldn't thaw meat on the counter: the surface warms into the danger zone while the centre stays frozen. Here are three safe…
Heat
Does Searing Meat Really Seal in the Juices?
Does searing seal in juices? No. A seared crust isn't waterproof and seared meat loses as much moisture. Here's why we still sear, and…
📘 7 min readHow Does a Pressure Cooker Cook So Fast?
A pressure cooker cooks faster by trapping steam, raising the boiling point of water to about 121°C (250°F). The science, the safety…
📘 7 min readWhat Is an Oil's Smoke Point (and Does It Matter)?
An oil's smoke point is the temperature where it starts to smoke and break down. See a smoke point chart for common oils and learn when…
📘 7 min readWhat Is the Maillard Reaction?
The Maillard reaction is the browning of amino acids and sugars that flavours seared steak, toast and coffee. Learn how it works and how…
📘 7 min readWhy Does Crowding the Pan Stop Food Browning?
Crowding the pan stops browning: too much food dumps water and steals heat, so it steams at 100°C instead of searing. How much space to…
📘 7 min readWhy Does Fried Food Get Greasy?
Fried food gets greasy when the oil is too cool, the fryer is crowded or food sits in oil. Learn the science of oil absorption and how…
Knife prep
Why Do Onions Make You Cry?
Why do onions make you cry? Cutting one releases a gas that triggers pain nerves in your eyes. Learn the chemistry and the tricks that…
📘 7 min readWhy Does Crushed Garlic Taste Stronger Than Whole?
Crushed garlic tastes stronger because breaking cells lets alliinase turn alliin into pungent allicin. Learn how cut, heat and timing…
📘 7 min readWhy Is a Sharp Knife Safer Than a Dull One?
A sharp knife is safer because it cuts with less force, so it stays on target instead of slipping. Learn the physics, honing vs…
Proteins
Do Marinades Actually Work?
Do marinades actually work? They flavour the surface and salt seasons deeper, but most barely penetrate or tenderise. Here is what works…
📘 7 min readHow Does Brining Work? Wet Brine vs Dry Brine
How does brining work? Salt loosens muscle proteins so meat holds more water as it cooks. Compare wet brine vs dry brine, with ratios,…
📘 7 min readWhat Is Carryover Cooking?
Carryover cooking is the temperature rise in meat after it leaves the heat. Learn why it happens, how many degrees to expect, and when…
📘 8 min readWhat Is the White Stuff That Comes Out of Salmon?
The white stuff on cooked salmon is albumin, a protein squeezed out as the fish heats. It is safe to eat. Learn why it appears and how…
📘 7 min readWhy Does Meat Need to Rest?
Why does meat need to rest after cooking? The real science of juice, heat and muscle fibres, how long to rest steak or roasts, and when…
📘 8 min readWhy Does Slow Cooking Make Tough Meat Tender?
Why does slow cooking make tough meat tender? Long, gentle heat melts collagen into gelatin. Learn the temperatures, best cuts and why…
📘 7 min readWhy Is My Chicken Breast Always Dry?
Why is my chicken breast always dry? Lean meat, uneven thickness and overcooking squeeze out its juice. Here is the science and five…
📘 7 min readWhy Isn't My Chicken Skin Crispy?
Why isn't my chicken skin crispy? Water is the enemy. Learn how to dry, salt and render chicken skin, why baking powder helps, and the…
Rice grains pasta
Do You Really Need to Soak Beans?
Do you need to soak beans? No, but soaking cuts cooking time, cooks them more evenly, and a salted soak gives creamier beans. Kidney…
📘 7 min readShould You Salt Pasta Water?
Yes, salt your pasta water: it is the only way to season noodles from inside. How much salt per litre, when to add it and why it won't…
📘 8 min readWhy Is My Rice Mushy or Sticky?
Rice turns mushy when grains take in too much water and burst. The right water ratios by variety, why rinsing and resting matter, and…
Sugar caramel
Maillard Reaction vs Caramelisation: What's the Difference?
Maillard reaction vs caramelisation: one browns protein and sugar together, the other browns sugar alone. Compare the temperatures,…
📘 8 min readWhat Does Sugar Actually Do in Baking?
Sugar in baking does far more than sweeten: it holds moisture, tenderises, traps air, browns and feeds yeast. Learn each job and what…
📘 8 min readWhy Does Caramel Crystallise and Turn Grainy?
Caramel turns grainy when dissolved sugar recrystallises, set off by a stray crystal or by stirring. Learn how to prevent it and fix…
📘 7 min readWhy Does Chocolate Seize?
Chocolate seizes when a little water turns its sugar into sticky syrup that glues cocoa particles into a stiff paste. Learn how to…
Vegetables
Waxy vs Starchy Potatoes: Which for Mash, Roast or Salad?
Waxy vs starchy potatoes: starch and water decide if a potato turns fluffy or holds its shape. Learn which to use for mash, roast, fries…
📘 7 min readWhy Are My Roasted Vegetables Soggy?
Roasted vegetables go soggy when they steam instead of roast. Learn how water, crowding, oven heat and oil decide crisp or limp, and the…
📘 7 min readWhy Do Apples and Avocados Turn Brown?
Apples and avocados turn brown when an enzyme, polyphenol oxidase, meets oxygen after cutting. Learn the science and the tricks that…
📘 8 min readWhy Do Green Vegetables Turn Grey When Cooked?
Green vegetables turn grey when heat and acid knock magnesium out of chlorophyll. Learn the science, the 7-minute rule, and how to keep…
📘 7 min readWhy Do Onions Get Sweet When You Cook Them?
Onions get sweet when cooked because heat kills their sharp sulfur compounds, frees hidden sugars and browns them. Here is why…
📘 6 min readWhy Does Red Cabbage Turn Blue (or Pink)?
Red cabbage turns blue because its anthocyanin pigments change colour with pH. Learn why acid keeps it red, why tap water turns it blue,…
