Shellfish with Fennel, Escarole, and Kale – Moveable Feast

Ingredients

• 2 Tbs. unsalted butter
• 2 Tbs. olive oil
• 12 grape tomatoes
• 1/2 cup thinly sliced fennel
• 3 medium cloves garlic, thinly sliced
• 1 cup thinly sliced escarole leaves
• 1 Tbs. amontillado sherry
• 1 cup fish broth or bottled clam juice
• 16 littleneck clams, scrubbed
• 16 mussels, debearded and scrubbed
• 6-1/2 oz. (1 cup) medium shrimp (41 to 50 per lb.; preferably wild), peeled and deveined, with tails left intact
• 1 cup thinly sliced kale leaves
• 1/8 tsp. crushed red pepper flakes
• 1/4 cup fresh flat-leaf parsley; more for garnish
• 1/2 tsp. fresh rosemary, minced
• Finely grated zest of half a lemon (2 tsp.)
• 1 tsp. fresh lemon juice
• Kosher salt and freshly ground black pepper