Tex-Mex tortillas with shredded pork and black beans

Name: Tex-Mex tortillas with shredded pork and black beans
Prep time: 30 min
Cook time: 1 h 20 min
Total time: 1 h 20 min
Yield: 6 portions
Ingredients: 40 g olive oil; 600 g pork meat piece, sinew free; ½ tsp salt; 2 pinch ground pepper; 150 g onions; 200 g ripe tomatoes; 20 - 30 g jalapeño chilli, canned; 120 g red pepper; 120 g green pepper; 250 g canned whole black beans; 30 g tomato purée (concentrated); 100 g water; ½ tsp chicken stock paste, homemade; 2 avocados; 6 corn tortillas; 4 tbsp fresh coriander leaves; 100 g sour cream; 1 lime