Garlic-Oregano Grilled Shrimp (Camarones Asada en Escabeche)

Heat 1/4 cup oil in a large skillet over medium-high heat until it shimmers. Add onion, oregano, peppercorns, bay leaves and 1/2 teaspoon salt and cook, stirring occasionally, until the onion starts to wilt, 4 to 5 minutes. Add chiles and garlic and cook, stirring frequently, until the garlic is fragrant but not colored, 30 seconds to 1 minute. Remove from heat and stir in vinegar. Transfer to a shallow glass baking dish and let cool while you grill the shrimp.

Preheat grill to medium-high.

Pat shrimp dry. Toss in a bowl with the remaining 1 tablespoon oil and 1/2 teaspoon salt. Thread the shrimp onto eight 12-inch skewers, leaving a little space between each one.

Grill the shrimp, turning once, until just cooked through, 3 to 4 minutes total.

Remove the shrimp from the skewers and add to the onion marinade, gently stirring to combine. Let marinate, stirring occasionally, for at least 20 minutes or up to 1 hour. Sprinkle with cilantro just before serving.