Mexican Al Pastor

Name: Mexican Al Pastor
Cuisine: American, Mexican, Latin American
Ingredients: 500g pork shoulder, thinly sliced; 2 dried guajillo chillies, seeds removed; 2 dried ancho chillies, seeds removed; 3 cloves garlic, minced; 1/4 cup white vinegar; 1/2 cup pineapple juice; 1 tsp ground cumin; 1 tsp dried oregano; 1/2 tsp ground cinnamon; 1/4 tsp ground cloves; 1 tbsp achiote paste (for authentic colour and flavour); Salt and black pepper to taste; 2 tbsp olive oil; Fresh pineapple slices; Small corn tortillas; 1/4 cup fresh cilantro, chopped; 1/4 cup onion, finely diced; Lime wedges for garnish; Salsa of your choice