Grilled Chipotle Chicken Kabobs

Ingredients

• 2½ tablespoons ground cumin
• 1 tablespoon chili powder
• 2 teaspoons coarse salt, divided
• 3 cloves garlic (minced)
• 1 white onion (halved and sliced)
• 3 cups neutral oil (avocado, grapeseed or cold-pressed canola)
• 2½ cups white vinegar
• 2 limes (halved)
• 1 orange (halved)
• 1 lemon (halved)
• 3 pounds boneless chicken thighs (fat trimmed)
• 2 yellow bell peppers (cut into 1-inch pieces)
• 1 tablespoon garlic powder
• 2 tablespoons paprika
• 2 teaspoons chipotle powder
• 4 scallions (thinly sliced)
• Zest of 3 limes