To prepare salsa, combine the first 7 ingredients in a medium bowl; stir until well blended. Cover and chill.
To prepare tacos, heat oil in a large nonstick skillet over medium heat. Add onion to pan; cook 2 minutes or until tender. Add garlic; cook 30 seconds. Add sliced mushrooms to pan; cook 4 minutes stirring occasionally. Stir in broth and next 7 ingredients (through chipotles). Cover, reduce heat, and simmer 10 minutes. Uncover and simmer 10 minutes or until liquid is nearly evaporated. Warm tortillas according to package directions. Serve pork mixture with tortillas and salsa.