Name: Double Mushroom Catsup
Ingredients: 1 gallon fresh mushrooms; 3 ounces coarse sea salt; 1 quart ready-made catsup

Double Mushroom Catsup

Ingredients

1 gallon fresh mushrooms
3 ounces coarse sea salt
1 quart ready-made catsup

Directions

Strew the salt over the fresh mushrooms.
Pour the ready-made catsup over the mushrooms.
Let the mixture sit for a period to allow flavors to meld.

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

What each ingredient does

Fresh mushrooms: Provide the main body and savory umami flavor of the ketchup.
Coarse sea salt: Draws moisture out of the mushrooms and helps preserve the mixture.
Ready-made catsup: Adds tomato sweetness and acidity that balance the earthy mushroom flavor.

“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.