Have you ever been faced with Jean's situation? You're out of an ingredient and cannot just run to the store? It's good to know that there are alternatives to the ingredient you're missing. Check out the ones I have listed below and then visit the link at the bottom of the post for more substitutes.
For one cup of buttermilk, substitute:
1 tablespoon lemon juice or vinegar (white or cider) plus enough milk to make 1 cup (let stand for 5-10 minutes)
or 1 cup plain whole milk yogurt
or 1 cup sour cream
or 1 cup milk plus 1 1/2 - 1 3/4 teaspoons cream of tartar
No ricotta cheese?
For one cup of ricotta cheese, substitute:
1 cup dry cottage cheese
No fresh herbs?
For one tablespoon of fresh herbs, substitute:
1 teaspoon of dried herbs
For one cup of ketchup, substitute:
1 cup tomato sauce, plus 1 teaspoon vinegar, plus 2 teaspoons organic maple syrup
No hot pepper sauce?
For 1 teaspoon of hot pepper sauce, substitute:
3/4 teaspoon cayenne pepper, plus 1 teaspoon vinegar
For more substitutions visit this link.