Tinga Hamburguesas with Cotija lime Slaw

Name: Tinga Hamburguesas with Cotija-lime Slaw
Ingredients: 2 lb freshly ground beef chuck; 8 oz mexican chorizo; 1 bay leaf, crumbled; 1 clove garlic, minced; 1/2 c grated onion; 2-3 chipotle peppers in adobo sauce, minced; 1 tsp mexican oregano; 1 tsp fresh thyme; 2 Tbsp tomato paste; 1/4 c fresh cilantro, finely chopped; 2 tsp kosher salt; 1/2 tsp freshly ground black pepper; 1 1/2 c shredded napa cabbage; 1/4 c finely chopped red onion; 2 Tbsp freshly squeezed lime juice; 1 Tbsp minced pickled jalapenos; 1 c shredded cotija cheese; 1/2 c sour cream; · oil to brush the grill; 6 sesame seed topped sturdy hamburger rolls; 6 tomato slices; 2 avocados, thinly sliced