Barbacoa Tacos

Name: Barbacoa Tacos
Ingredients: 2 ripe plum tomatoes; 1 small white onion, quartered; 2 cloves garlic; 4 chipotle peppers in adobo sauce; 3 teaspoons kosher salt; 1.5 teaspoons chili powder; 1 teaspoon ground cumin; 0.5 teaspoon freshly ground black pepper; 1 (3 pound) beef chuck roast; 2 tablespoons olive oil; 1 cup water; 1 tablespoon light brown sugar; 2 teaspoons dried oregano; 3 fresh bay leaves; 1 tablespoon lime juice; corn tortillas, warmed; 2 ripe avocados, peeled, pitted and sliced; 0.5 bunch radishes, thinly sliced; 2 tablespoons chopped fresh cilantro, or to taste