"When newly opened, Viola flowers may be used to decorate salads or in stuffings for poultry or fish. Soufflés, cream and similar desserts can be flavoured with essence of Viola flowers. The young leaves are edible raw or cooked as a somewhat bland leaf vegetable. The flowers and leaves of the cultivar ‘Rebecca’, one of the Violetta violets, has a distinct vanilla flavor with hints of wintergreen, however, that is quite delicious in salads."
Viola (plant) - Wikipedia, the free encyclopedia
I’m aware of a number of edible plants, but this use of violets is news to me. Good news, since I’m about to go out and see what I can pick to supplement the food I purchased earlier.