3 tablespoons fresh lemon juice
20 large shrimp, peeled and deveined
1/2 teaspoon coarse salt
Freshly ground pepper, to taste
2 medium Belgian endives, leaves separated, larger ones cut into 1 1/2-inch pieces (about 3 cups)
1 1/2 ripe Hass avocados, halved, pitted, peeled, and cut lengthwise into 1/2-inch-thick slices
1 tablespoon coarsely chopped fresh tarragon
