1 1/4 pounds trimmed boneless pork shoulder, cut into 1 1/2-inch cubes
1/4 teaspoon dried marjoram
1/4 teaspoon dried thyme
3 bay leaves
3/4 pound red potatoes, cut into 1/2-inch dice
2 tablespoons vegetable oil
1 large fresh chorizo, casing removed
1 medium onion, finely chopped
1 garlic clove, minced
One 28-ounce can peeled Italian tomatoes, chopped and drained
2 chipotle chiles in adobo, seeded and minced, plus 4 teaspoons sauce
Salt and sugar, for seasoning