-I admit that I don't love raw onion, so when I make fava, I do of course add the onion to the simmering liquid but I don't chop raw onion for the garnish. Instead, I use some chopped green onion or cooked, caramelized onions. If you don't mind a little raw onion, however, chop some up finely, rinse the pieces well under cold running water, and then garnish with them. This will remove a lot of the bite and smell of the onion, but preserve that distinct flavor.