Tzatziki is traditionally made with Greek yogurt, lemon juice, garlic, herbs, and shredded cucumber. I love tzatziki, but I question whether cucumber is the best vegetable for this dish; it can be a bit bland, and it weeps when salted.
Why not the beet instead? Its earthiness provides a perfect compliment for the Greek yogurt, while its redness brings an invigorating personality to the color palette of a falafel sandwich. Peeling and grating beets can be quite a messy business, but c'est la vie. Put on that old shirt you've been meaning to throw away and just go for it, I say. Read more.