Makes: 1 1/2 cups. Prep: 5 minutes. Steam: 12 minutes.
Steam broccoli florets for 6 minutes. Rinse with cold water to cool quickly. Set aside and repeat with cauliflower florets. Refrigerate, along with grape tomatoes, until serving.
In a medium-sized glass bowl, stir together yogurt, sour cream, lemon juice, dill, sugar, garlic salt and black pepper. Refrigerate until serving, but less than 48 hours. Serve with veggies.