Possible Clues:

• Topping that becomes the food it's eaten with when its vowels are changed to A's
• What gives some gripes — tomato sauce
• Herbal sauce
• Sauce
• Chimichurri cousin
• Sauce NYT Cooking described as "a mouthful of bright summer"
• Made, as one's case
• Undesirable duck sauce
• Sauce whose name derives from "pound" in Italian
• Sauce made with garlic, basil leaves and pine nuts