In a bowl, mix 1 cup plain Greek yoghourt, as much garlic as you like (I used a couple of cloves finely chopped, but I really like garlic), a generous pinch of salt, a pinch of cayenne pepper (I used a bit more), as much finely cut dill as you like, a tablespoon of olive oil, and a tablespoon of lemon juice. Add the chard in when it's cooled down and well strained, and mix it all together.
Instead of garlic, you could use 1 or 2 finely minced or pureed garlic scapes.