Recipe: Paleo Chili

Name: Recipe: Paleo Chili
Ingredients: 1 pound beef chuck, cut into 1-inch cubes; 3 tablespoons olive oil, divided; 1 pound lean ground beef; 1 large yellow onion, diced; 1 medium red bell pepper, cored, seeded, and diced; 2 medium carrots, peeled and diced; 2 stalks celery, diced; 1 medium sweet potato (about 12 ounces), peeled and cut into 1/2-inch cubes; 3 cloves garlic, minced; 3 tablespoons chili powder; 2 tablespoons tomato paste; 1 tablespoon unsweetened natural cocoa powder; 1 tablespoon ground cumin; 2 teaspoons dried oregano; 1/2 teaspoon ground cinnamon; 1 teaspoon kosher salt, plus more for seasoning; 1/2 teaspoon freshly ground black pepper, plus more for seasoning; 1 (28-ounce) can fire-roasted diced tomatoes; 3 cups low-sodium chicken broth; 1 tablespoon apple cider vinegar; 1 medium avocado, diced; 2 medium scallions, thinly sliced; 1/2 cup coarsely chopped fresh cilantro