Barbecue Beef

From 'Mexico The Cookbook' by Margarita Carrillo Arronte
 
Barbecue Beef Mexico The Cookbook gives us not 1, but 2 different recipes for Mexican-style Barbecue Beef. This second recipe is mainly enjoyed throughout Southern Mexico, including Puebla, Morelos, and Tlaxcala

Ingredients  
Recipe
  1. Put the chillies in a heatproof bowl, pour in boiling water to cover, and let soak for 15 minutes. Drain, reserving the soaking water.
  2. Put the chillies, garlic, cumin, allspice, cloves, cinnamon, oregano, thyme, bay leaves, and a pinch of salt into a blender. Pour in 250ml of the reserved soaking water and the vinegar and process thoroughly until combined.
  3. Put the meat into a dish, add the spice mixture, and toss well to coat. Put 100g of the meat on each mixiote sheet. Fold up the sides to make the packages and tie with string.
  4. Put the packages in a steamer and cook for 1 hour until the meat is tender. Check the water level in the pan frequently and top up with boiling water when necessary.
  5. Meanwhile, make the Salsa:
    1. Preheat the oven to 180°C.
    2. Put the tomatillos and chillies in a roasting pan and roast for 15 minutes. Remove the pan from the oven.
    3. Put the tomatillos, chillies, and onion into a blender and process until thoroughly combined.
    4. Heat the oil in a pan, add the mixture and cook, stirring occasionally, for 10 minutes. Remove the pan from the heat.
  6. When the meat is cooked and tender, remove the steamer from the heat and lift out the packages. Put them on a serving plate and serve immediately with the salsa, avocado slices, and lettuce leaves.