Slow-Cooked Pork Tacos

Ingredients

• 2 teaspoons cumin seeds
• 1 teaspoon coriander seeds
• 2 teaspoons ancho chili powder
• 1 teaspoon chipotle chili powder
• 1/2 teaspoon dried oregano
• 2 pounds boneless pork shoulder (not too lean), cut into 3/4-inch chunks
• kosher salt
• vegetable oil
• 1 medium yellow onion, finely chopped
• 1 poblano pepper, finely chopped
• 1 serrano chili, seeded and finely chopped
• 2 garlic cloves, minced
• 1 cup canned diced tomatoes, with their juices
• 1 1/2 cup chicken stock (homemade or low sodium)
• 2 large limes
• corn tortillas
• 2 avocados
• pickled onions (recipe below)
• cilantro, washed and dried
• sour cream (optional)
• 1 medium red onion
• 1 tablespoon kosher salt
• 2 tablespoons sugar
• 1/4 medium beet, peeled
• handful cilantro
• cider vinegar