Lobster, Chayote, and Mango Tostadas with Chipotle Crema

Tostada is the generic name for tortilla chips; it is also the name given to small round corn tortillas that have been fried crisp and topped with something juicy and saucy. This sophisticated and fresh-tasting lobster “salsa” balances sweet lobster meat, spicy chipotle, and fresh mango with a touch of crisp, pale-green chayote. The tostadas should be freshly fried and sprinkled with a little ground chile and salt, or try the low-fat tostada method. Shrimp