Baked humus balls with yogurt dressing (plus a vegan option)

Name: Baked humus balls with yogurt dressing (plus a vegan option)
Prep time: 15 min
Cook time: 25 min
Total time: 40 min
Cuisine: Greek, Mediterranean
Ingredients: 1 medium tomato; 2 cups chickpeas, cooked; 1/2 cup tahini; 1/2 cup water; 1/4 cup olive oil; 1 cup chopped parsley; 1/2 cup chopped scallions; 1 1/2 teaspoon cumin; 2 teaspoons oregano; 1 teaspoon paprika; 1 teaspoon sugar, optional; 3 tablespoons lemon juice; 1 clove garlic, minced; 4 cups breadcrumbs; salt and pepper to taste; semolina flour or polenta for coating (about 1/2 cup); 1/2 cup greek yogurt (or coconut yogurt); 2 teaspoons lemon juice; 1/2 teaspoon lemon zest; pinch of salt; fresh chopped parsley and scallions for serving