I've eaten them. They never make it to the salad bowl --- I just eat them in the garden -- leaves & blooms both. Peppery but mild peppery.
Chelle, the old saying is treat nasturtiums nasty & that's why I call them nasties. The worse you treat them, the more they like it. You're killing them with kindness. They like it dry too. And Natalie has the right of it. Poke a hole, drop them in, cover them over & forget about them.