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Clear Apple Jelly

A clear jelly made from apples, lemon peel, and sugar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Lemon and apple are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 7,551 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Clear Apple Jelly

Ingredients

Directions

Prepare the juice

  1. Pare and core the apples, then place them in a pan and cover with water.

  2. Boil gently until the apples are soft, then let them cool.

  3. Strain the mixture through a jelly bag to extract the juice.

Make the jelly

  1. In a preserving pan, combine the juice with sugar and lemon peel.

  2. Boil until it reaches the stiffness of calf's-foot jelly, skimming as needed.

  3. Add the juice of one lemon before finishing.

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.

  1. Lemon + appletop 14% of all pairs
    Smell alikemoderate
    Cooked together7,551 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

  2. Apple + sugartop 18% of all pairs
    Smell alikelow
    Cooked together16,478 recipes

    Shared aroma: beta-damascenone (apple, rose).

  3. Lemon + sugartop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

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

Apple and sugar barely smell alike, yet cooks put them together in 16,478 recipes: they work on texture and structure more than aroma.

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

What each ingredient does

Lemon pippins or other acid apples
Their natural pectin and acidity help the juice set into a firm jelly.
Fine sugar
Sweetens the jelly and helps it set by binding water and pectin together.
Lemon peel
Adds aromatic oils that flavour the jelly as it cooks.
Lemon juice
Adds acidity that brightens flavour and supports setting.

The step that matters

Boiling to the right stiffness. Cooking long enough concentrates sugar and pectin so the jelly sets; undercooked jelly stays runny, while overcooking can make it tough and dull in flavour.

Swap the lemon

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

  1. Pearfits better
  2. Vanillafits better
  3. Apricotfits better
  4. Lemonthe original

Fit is the average pairing score against apple, sugar. 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.

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