butter or margarine
Sometimes you can. It all depends on how similar the substitute tastes to the original ingredient.
agave syrup
flour
What is the dry equivalent to a head of dill?
scapes substitute
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generic substitute for januvia
scapes substitute
The eggs you can substitute are duck, goose or ostrich eggs - basically any egg. All eggs have the same nutritional value, but make sure the eggs you use are fresh. When cooking, check the desired size. The nutrition value is the same in all eggs but not the size. For example, don't substitute a jumbo egg for a peewee egg (these are sizes) as you will get too much wet ingredient than desired for that recipe. Also, don't substitute a peewee egg for a jumbo egg because you won't get enough wet ingredient.
Kirshwasser is a type of brandy, so you can substitute with any brandy or just leave it out, it is not an essential ingredient, just adds a bit of extra luxury and richness..
In the game of Scrabble, you can use the word "exert" as a substitute for "apply effort".
A characterizing ingredient is the main ingredient in a dish that gives it its character. For example, a chicken noodle casserole would have chicken as its characterizing ingredient; peanut butter would be the characterizing ingredient in peanut butter cookies.