Molasses
Also called treacle
Molasses is a syrupy byproduct of sugar making, offering deep flavors with a robustly sweet profile.
Molasses is the thick, dark syrup left over when sugar cane juice is boiled and the sugar crystals are spun out. Each round of boiling removes more sugar, giving light molasses first, then dark, and finally the intense, bitter blackstrap. In the UK, black treacle is a close cousin.
It tastes deeply sweet but not simply sweet: warm, earthy and slightly bitter, with notes of caramel, smoke and liquorice. Cooks love it because a spoonful adds depth that sugar can't, giving gingerbread its chew, baked beans their dark glaze and barbecue sauce its sticky, smoky backbone.
Flavor profile
Aroma: rich, earthy, caramel-like
Good to know
Origin: West Indies
Forms: light, dark, blackstrap
Season: Available year-round as a pantry staple, and especially easy to find in the run-up to holiday baking season.
Nutrition: Blackstrap molasses contains minerals such as iron and calcium, but it is used in small amounts, so it adds flavour more than nutrition.
Storage: Keep molasses tightly sealed in a cool, dark cupboard. Unopened, it keeps for a year or more; once opened, it stays good for about six months to a year at room temperature, or longer in the fridge, though it becomes very thick when cold. Wipe the rim before closing so the lid doesn't glue shut. Throw it out if you see mould or it smells sour or fermented. It rarely spoils, but its flavour slowly fades.
How to use molasses
Create a Spiced Cookie
Molasses adds moisture to cookies; its acidity reacts with baking soda to leaven and tenderize.
Make a Savory Glaze
Combine molasses with soy sauce; heat caramelizes the sugar, balancing the savory.
The science of molasses
- Molasses is what remains after sugar crystals are removed from boiled cane juice. Each boiling concentrates the minerals and dark flavour compounds and leaves less sugar behind, which is why blackstrap is far less sweet and more bitter than light molasses.
- Repeated boiling drives the Maillard reaction and caramelisation, creating dark melanoidin pigments and roasty, bittersweet aromas.
- Molasses is mildly acidic, so it reacts with baking soda to release carbon dioxide. That reaction helps gingerbread and molasses cookies rise and spread, and keeps their crumb tender.
- Like brown sugar, which is simply white sugar coated in molasses, it is hygroscopic and holds onto moisture. That keeps bakes soft and chewy for days.
- Some molasses is labelled sulphured, meaning sulphur dioxide was used as a preservative when processing young cane. Unsulphured molasses has a cleaner, sweeter taste and is the usual choice for baking.
How to choose molasses
Choose light or dark unsulphured molasses for baking and glazes. Use blackstrap only where a recipe asks for it, because its bitterness can take over. Black treacle can replace dark molasses in most British and North American recipes.
Substitutes for molasses
| Swap | Amount | What changes |
|---|---|---|
| Dark brown sugar + water | ¾ cup packed brown sugar + ¼ cup water per 1 cup molasses | Gives similar colour and caramel flavour, with a little less depth and bitterness. |
| Black treacle | 1:1 | Almost the same as dark molasses, slightly more bitter. The best like-for-like swap. |
| Dark honey or maple syrup | 1:1 | Similar texture and sweetness, but much lighter in flavour. Add a pinch of cocoa or espresso for depth. |
| Date syrup | 1:1 | Dark and fruity with a rich, caramel edge. Works well in cookies and glazes. |
What goes with molasses
- Mustard. Molasses' sweetness tames mustard's heat, making a sweet-savory glaze.
- Soy Sauce. Molasses and soy sauce both have dark, complex caramel notes from Maillard reactions.
- Clove. Molasses's bitter-sweet depth meets clove's warm eugenol in gingerbread.
- Pecan. Molasses's bitter-sweet depth suits pecan's buttery richness in pie.
- Pork Belly. Molasses's dark sweetness caramelizes on rich pork belly.
- Pork Shoulder. Molasses's bitter-sweet depth glazes pork shoulder.
- Smoked Paprika. Molasses's dark sweetness pairs with smoked paprika in barbecue rubs.
- Vinegar. Vinegar's sharp acid cuts molasses's dark sweetness in barbecue sauce.
Mistakes to avoid
- Too much molasses can turn bitter from its organic acids.
- Cold molasses thickens and may clump in liquids.
Ideas for tonight
- Mix into BBQ sauce for depth.
- Add to baked beans for sweet-savory contrast.
- Stir into oatmeal with cinnamon.
Molasses: questions
What is the difference between light, dark and blackstrap molasses?
They come from successive boilings of cane juice. Light molasses is the sweetest and mildest, dark is thicker and stronger, and blackstrap is the most concentrated, least sweet and quite bitter.
Is treacle the same as molasses?
Black treacle is very close to dark molasses and can be swapped 1:1. Golden syrup, sometimes called light treacle, is completely different: pale, buttery and much milder.
Can I use blackstrap molasses in baking?
You can, but use it sparingly. Its bitterness can dominate, so swap only part of the molasses for blackstrap, or add extra sweetener to balance it.
Does molasses go bad?
It keeps a long time thanks to its high sugar content, but it can grow mould or ferment if water gets in. If it smells sour or shows mould, throw it out.
How do you make brown sugar with molasses?
Mix 1 tablespoon molasses into 1 cup white sugar for light brown sugar, or 2 tablespoons for dark brown sugar. Rub it together with your fingers or a fork until even.
How do you measure molasses without it sticking?
Lightly oil the measuring cup or spoon first, and the molasses will slide right out. Room-temperature molasses also pours more easily than cold.
What does molasses taste like?
Molasses is a syrupy byproduct of sugar making, offering deep flavors with a robustly sweet profile. Its strongest notes are warm, sweet, earthy, with an aroma that is rich, earthy, caramel-like.
What goes well with molasses?
Molasses pairs best with mustard, soy sauce, clove, pecan, pork belly. Molasses' sweetness tames mustard's heat, making a sweet-savory glaze.
How do you use molasses in cooking?
Create a Spiced Cookie: molasses adds moisture to cookies; its acidity reacts with baking soda to leaven and tenderize.
How should you store molasses?
Store in a cool, dark place.
What is the most common mistake with molasses?
Too much molasses can turn bitter from its organic acids.
Ginger
Cinnamon
Clove
Pecan
Pork Shoulder
Smoked Paprika
Mustard
Sugar