Onions are considered an indispensable ingredient of most Indian cooking, providing the pungent foundation for a thousand different curries and other dishes.

"Discipline is an indispensable ingredient in the military establishment," Mr. Schleuter said.

Oil is an indispensable ingredient of salad dressings and mayonnaise.

Death is the indispensable ingredient in having to believe.

Lacking these data, the agencies would be missing one of the indispensable ingredients of successful management.

Nelson's improvising has been an indispensable ingredient.

Making that clear is an indispensable ingredient in any honorable Senate compromise.

Singapore, though, has been inhospitable to individualism - that indispensable ingredient of entrepreneurial culture.

He is an indispensable ingredient to my craft as an actor.

The indispensable ingredient of a military machine is discipline, which implies unflagging loyalty and unquestioned obedience.