Pulled Pork Tacos with Citrus Salsa

INGREDIENTS

• One 14.5-ounce can low-sodium chicken broth (2 cups)
• 3 cloves garlic, smashed
• Eight 6-inch corn tortillas
• 3 large oranges
• 3 jalapeno chiles, halved lengthwise
• 1/2 teaspoon kosher salt
• 1 onion, coarsely chopped
• 1 tablespoon agave or honey
• 1 tablespoon whole cumin seeds or 1 teaspoon ground cumin
• 2 tablespoons grapeseed oil
• 1 tablespoon white wine vinegar
• 1 tablespoon kosher salt, plus more for seasoning
• 1/2 head napa cabbage, finely shredded (about 2 cups)
• 1 teaspoon freshly ground black pepper, plus more for seasoning
• 1 grapefruit
• 1/4 teaspoon freshly ground black pepper
• One 3-pound boneless pork shoulder, trimmed, cut into 1 1/2-inch pieces
• 3 tablespoons extra-virgin olive oil
• 1 cup orange juice