Carnitas

Name: Carnitas
Ingredients: 1 boneless pork shoulder roast (approximately 4 pounds); Salt and pepper; 1/4 cup olive oil; 1 1/2 large yellow onions; 8 garlic cloves, minced; 2 jalapeños, diced; 2 cans beer, preferably lager; 3/4 cup unsweetened coconut milk; 2 medium oranges, grated zest and juice; 1 lime, grated zest and juice; 2 teaspoons dried Mexican oregano; 2 cups chicken broth, as needed; 16 tortillas, either corn or wheat (the freshest you can find); Lime wedges, avocado slices, chopped cilantro, and chopped onions, for garnish