Wet mixture: 40g toasted walnuts, roughly chopped 1 tbsp butter for frying 1 large onion, diced 2 stalks celery, finely diced 3 eggs 2 teaspoons brown sugar 130g strained yogurt (I originally used part sour cream, but I found the result too rich) 4 tablespoons chopped parsley, cilantro, basil and/or dill Dry mixture: 110g  AP flour 1 to 1.5 teaspoon salt 1 teaspoon baking powder Spices: 2 teaspoo