Avocado, Grapefruit and Hearts of Palm Salad
Ingredients 4 red grapefruits 1 tablespoon tamarind concentrate 1 tablespoon freshly squeezed lime juice 1 tablespoon sugar 1/2 teaspoon Asian fish sauce 1/4 teaspoon ground cumin 1/2 cup canola oil Salt Tabasco 4 avocados, cut into 1-inch pieces 1 small red onion, thinly sli