Some people like theirs to float; others prefer sinkers. While ours do sink, they're far from leaden. Their lightness doesn't come from leaveners like baking powder or egg whites, though; it's because we rest the matzo mixture in the fridge for at least two hours, where it hydrates and expands.

Are matzo balls supposed to float?

If you've followed instructions carefully, the balls should be floating on the surface of the water like billowy clouds of deliciousness. If they still seem dense or tight, they haven't cooked long enough. The should look soft and airy. Test for doneness by slicing a test matzo ball in half.

How do you know when matzo balls are done?

When you think a matzah ball might be done, take it out of the boiling water, and cut it in half with a sharp knife. The matzah balls are ready when the consistency and color are the same throughout.