Zuppa di aragosta del Venerdì Santo

• 1 small spiny lobster
• 11 ounces (300 g) small shrimp

Boil the lobster in about 3 quarts (3 liters) lightly salted water for about 15 minutes. Drain the lobster and let cool. Remove the meat from the shell, discard the carapace, and then cut the meat into sma