Hmmm that depends on what you're making. They have only a faint onion flavour, so sesame seeds (white or black) would probably work if you're just looking to sprinkle some on top of a bread. I'd go with something really mild like that.
Oops, just saw the tag "tadka" - in this case, I wouldn't do sesame seeds! Agree with HalfPint on the cumin or celery see. Or you could just add some finely chopped onion sauteed in ghee/butter/oil.
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Or they can generally be left out entirely, too.