Clam juice amplifies the brininess of this seafood risotto, which relies on such sharp flavors as lime juice and cayenne to enhance the taste of the shrimp and clams.
Bring stock to a simmer in a 2-qt. saucepan over medium and keep warm. Melt butter in a 6-qt. saucepan over medium-high. Add garlic and shallot and cook until soft, 3–4 minutes. Add ri