Skip to main content
Drink

Foam Sauce

A light, sweet sauce made from sugar, butter, flour, and boiling water, optionally flavored with lemon, vanilla, or orange.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
Jump to recipe ↓

Why it works: Butter and flour are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Foam Sauce

Ingredients

Directions

Make the sauce

  1. In a bowl, beat together sugar, butter, and flour until smooth.

  2. Place the mixture over low heat.

  3. Stir in the boiling water gradually.

  4. Add lemon, vanilla, or orange for flavor if desired.

Serve

  1. Serve with sponge cake or puddings.

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. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Sugar + flourtop 15% of all pairs
    Smell alikemoderate
    Cooked together92,116 recipes

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

  3. Butter + lemontop 16% of all pairs
    Smell alikemoderate
    Cooked together41,227 recipes

    Shared aroma: 3-hexenal (apple, fruity).

  4. Flour + lemontop 17% of all pairs
    Smell alikemoderate
    Cooked together30,404 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Sugar + buttertop 17% of all pairs
    Smell alikemoderate
    Cooked together98,233 recipes

    Shared aroma: guaiacol (smoky, sweet).

Butter and flour barely smell alike, yet cooks put them together in 124,287 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

Sugar
Adds sweetness and helps give the sauce its body.
Butter
Adds fat and richness, giving the sauce a smooth, rounded mouthfeel.
Flour
Thickens the sauce as it heats with the liquid.

The step that matters

Stirring in the boiling water gradually. Adding the liquid slowly while stirring keeps the flour and butter mixture smooth. Adding it all at once can trap lumps of starch that are hard to break up later.

Swap the lemon

The recipe marks lemon as optional. How well each one fits the dish's main ingredients (sugar, butter, flour):

  1. Raisinfits better
  2. Vanillafits better
  3. Figfits better
  4. Lemonthe original

Fit is the average pairing score against sugar, butter, flour. 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.

More foam sauce recipes

Cobalt 3 See all 44 →

You might also like

Lemon WheyLemon Whey33 recipesLemon WineLemon Wine31 recipesLemon SquashLemon Squash10 recipesLemon EssenceLemon Essence8 recipes