Shrimp Ceviche Served in Coconuts

Name: Shrimp Ceviche Served in Coconuts
Ingredients: 1 lemon, halved; 1 head garlic, halved; 3 bay leaves; 8 peppercorns; Sea salt; 1 1/2 pounds large shrimp, peeled; 2 cups coconut milk; 1/2 cup lime juice (about 6 to 8 limes), plus more for drizzling; 1 red onion, sliced thin; 2 serrano chiles, sliced thin; 1/2 bunch freshly chopped cilantro leaves, plus more for garnish; 4 coconuts; 2 cups rock or kosher salt, for serving; Extra-virgin olive oil, for drizzling