This Southern Louisiana dish features chayote squash mirlitons combined with ham, shrimp, bread crumbs, and a savory seasoning.
Bring a large pot of water to a boil. Add mirlitons; boil until tender, about 45 minutes. Drain, cool, peel, cut in half, remove seeds, and cut into cubes.
When mirliton almost done, bring another pot of water to a boil. Add shrimp; cook until pink, about 5 minutes. Drain shrimp; reserve water.
Preheat the oven to 250°F (120°C).
Heat olive oil in a large skillet over medium-high heat. Add onion and garlic; cook until soft. Transfer to a 9x13-inch baking dish. Stir in mirliton, shrimp, ham, and egg. Mix in 1 cup bread crumbs, parsley, thyme, salt, and black pepper. If needed, add a little more shrimp cooking water for moisture.
At this point, you can choose to bake, refrigerate, or freeze the casserole. Top with remaining 0.5 cup breadcrumbs if desired.
Bake in the preheated oven until golden brown on top, about 1 hour and 30 minutes.
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