Authentic Tacos Al Pastor

Cook tomato on a ridged grill pan over medium-high heat until slightly blackened, about 5 minutes.

Remove from heat and cool until easily handled.

Peel off skin and remove seeds.

Bring a small pot of water to a boil.

Add guajillo and ancho chile peppers; cook until softened, about 5 minutes.

Combine tomato flesh, softened chile peppers, 2 slices pineapple, orange juice, quartered onion, vinegar, chipotle peppers, salt, garlic, cloves, cumin seeds, and oregano in a blender; blend until smooth.

Arrange pork slices in a glass or ceramic baking dish.

Pour blended mixture over pork, ensuring all sides are evenly coated.

Cover baking dish with plastic wrap.

Marinate pork in the refrigerator, 4 hours to overnight.

Cook remaining pineapple slices on a ridged grill pan over medium-high heat until slightly blackened and soft, about 5 minutes per side.

Chop into small pieces.

Wipe out grill pan and preheat over medium-high heat.

Cook marinated pork in the hot pan, turning once, until browned, 4 to 5 minutes.

Chop pork coarsely into small pieces against the grain.

Serve with pineapple, chopped onion, and cilantro.