Name: Poached Egg on Toast
Ingredients: 1 slice of bread; Butter, to taste; 1 or 2 fresh eggs; Coarse sea salt, to taste; A few drops of lemon juice; Fresh parsley, for garnish

Why it works: Lemon and parsley match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 14,037 recipes. Both carry beta-phellandrene, which smells minty, terpene. The science ↓

Poached Egg on Toast

Ingredients

Directions

Prepare the toast

Toast the slice of bread until golden brown and butter the toast well.
Trim off the crust of the toast.

Poach the egg

Break an egg into a cup.
Drop the egg into fast-boiling water with salt and lemon juice.
Keep the pan on the heat until the egg whites harden.
Remove the egg with a slotted spoon.

Serve

Place the egg on the prepared toast.
Garnish with fresh parsley.
Serve.

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.

Lemon + parsleytop 1% of all pairs

Smell alikestrong

Cooked together14,037 recipes

Shared aroma: beta-phellandrene (minty, terpene).
Bread + buttertop 7% of all pairs

Smell alikemoderate

Cooked together27,232 recipes

Shared aroma: delta-decalactone (sweet, creamy).
Bread + eggtop 13% of all pairs

Smell alikemoderate

Cooked together22,662 recipes

Shared aroma: (e)-2-octenal (fatty, green).
Butter + parsleytop 15% of all pairs

Smell alikemoderate

Cooked together28,563 recipes

Shared aroma: trans-2-hexenal (green, leafy).
Bread + parsleytop 15% of all pairs

Smell alikemoderate

Cooked together8,588 recipes

Shared aroma: 2,4-decadienal (seaweed).

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

What each ingredient does

Eggs: Egg whites set around the yolk, forming the main body of the dish.
Bread: Toasted base that gives a crisp, sturdy surface for the egg.
Butter: Adds richness and moisture to the toast.
Lemon juice: Acidity in the poaching water helps the egg white hold together.

The step that matters

Keep the pan on the heat until the egg whites harden. Egg whites set between about 60 and 85 °C, so the water must stay hot enough to firm the white while the yolk remains soft. Too little heat leaves the white runny; too much heat toughens the yolk and makes the egg rubbery.

“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.