Name: Carrot, Pineapple, and Rhubarb Marmalade
Ingredients: 1 cup ground carrot; 1 cup unpeeled rhubarb, cut into small pieces; 1½ cups shredded pineapple, cooked until tender; 1½ cups sugar; 1 lemon, quartered and sliced; a little gingerroot (optional)

Why it works: Rhubarb and lemon match in chemistry and in kitchens. They rank in the top 7% of all ingredient pairs, and cooks put them together in 546 recipes. Both carry acetic acid, which smells sour, vinegar. The science ↓

Carrot, Pineapple, and Rhubarb Marmalade

Ingredients

1 cup ground carrot
1 cup unpeeled rhubarb, cut into small pieces
1½ cups shredded pineapple, cooked until tender
1½ cups sugar
1 lemon, quartered and sliced
a little gingerroot (optional)

Directions

Combine the ground carrot, rhubarb, and cooked pineapple in a pot.
Add the sugar and lemon slices.
Cook without stirring until the mixture thickens.
Season with gingerroot if desired.

Recipe from a historical cookbook (Internet Archive).

Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.

Rhubarb + lemontop 7% of all pairs

Smell alikestrong

Cooked together546 recipes

Shared aroma: acetic acid (sour, vinegar).
Carrot + lemontop 9% of all pairs

Smell alikestrong

Cooked together3,351 recipes

Shared aroma: trans-2-nonenal (cardboard, fatty).
Rhubarb + pineappletop 10% of all pairs

Smell alikestrong

Cooked together56 recipes

Shared aroma: methyl cinnamate (strawberry).
Carrot + rhubarbtop 11% of all pairs

Smell alikestrong

Cooked together40 recipes

Shared aroma: methyl cinnamate (strawberry).
Pineapple + lemontop 12% of all pairs

Smell alikemoderate

Cooked together1,964 recipes

Shared aroma: 2-nonenal (fatty, green).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Sugar: Sweetens the marmalade and helps it thicken as it cooks into a set spread.
Rhubarb: Adds tartness and acidity that balances the sweetness and brightens the flavour.
Lemon: Contributes acidity and natural pectin that help the marmalade set.
Ground carrot: Provides body and bulk, giving the marmalade a thick, spreadable texture.
Pineapple: Adds moisture and fruity sweetness, softening the mixture into a spreadable base.

The step that matters

Cook without stirring until the mixture thickens. Thickening depends on sugar concentrating as water evaporates and pectin setting as the mixture cools. Stirring constantly can prevent the mixture from reaching a proper set.

Swap the carrot

How well each one fits the dish's main ingredients (rhubarb, pineapple, sugar, lemon):

Arrowrootfits better
Beetrootfits better
Sweet potatofits better
Carrotthe original

Fit is the average pairing score against rhubarb, pineapple, sugar, lemon. Candidates are from the same food group and used in at least 100 recipes.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.

Lemon Cake228 recipes

Rhubarb Pie152 recipes

Lemon Ice147 recipes

Pineapple Sherbet116 recipes

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Carrot, Pineapple, and Rhubarb Marmalade