Chimichangas

Name: Chimichangas
Prep time: 40 min
Cook time: 3 h 30 min
Total time: 4 h 10 min
Cuisine: American
Ingredients: To serve: sour cream; 3 dried long red chillies; 1½ tsp each cumin and coriander seeds; ½ tsp white peppercorns; 1 tsp dried oregano; 4 golden shallots, coarsely chopped; 4 garlic cloves, coarsely chopped; 1 kg beef brisket, cut into 10cm pieces; 2 tbsp vegetable oil; 1 tbsp each ground chilli and paprika; 500 ml veal stock (2 cups); 1 tbsp cornflour mixed with 1 tbsp cold water; 520 gm plain flour; 90 gm lard (see note); 100 ml vegetable oil; 2 avocadoes, coarsely chopped; 2 golden shallots, finely chopped; 1 garlic clove, crushed; Juice of 2 limes, or to taste; 2 tsp Worcestershire sauce; Few drops Tabasco, or to taste