Step 1: Heat up your grill to high heat and grease the grates with oil. In a small bowl, whisk together the olive oil, garlic, lime zest, lime juice, oregano, kosher salt, black pepper, and red pepper flakes.
Step 2: Lightly drizzle the avocado quarters with oil. Grill them, turning once, until you see grill marks on the flesh side and the avocados have slightly softened, about 2 minutes per side.
Step 3: Scoop out the avocado flesh onto a plate. Give the vinaigrette a quick whisk, then drizzle it over the avocados. Garnish with sea salt and cilantro. Serve with lime wedges on the side. Enjoy your grilled avocado delight!