The flavors of a margarita - tequila, orange and lime - are blended in a tossed salad of fresh shrimp, diced avocado and sliced red onion, spiked with a creamy, spicy sour cream dressing. Don't shy away from avocados because they're high in calories - avocados are rich in good, heart-healthy fat, as well as vitamin E, folate, potassium and other important nutrients.