Shrimp, Avocado and grapefruit salad

Ingredients

• 1/4 c. raw pumpkin seeds (pepitas)
• 1/4 c. plus 1 tablespoon extra-virgin olive oil
• 2 Tbs. fresh lime juice
• 1 small shallot, thinly sliced
• 1/3 c. chopped cilantro
• 1 large grapefruit
• 1 Hass avocado, cut into W-inch lengthwise wedges
• Salt and freshly ground pepper
• 1 lb. pound shelled and deveined large shrimp
• 1 Head of Boston lettuce, torn Into bite-size pieces