Torta de Milanesa con Frijoles y Aguacate (Breaded Beef Sandwich with Refried Black Beans and Avocad

Ingredients

• 1 red onion, chopped
• 2 tbsp (30 ml) olive oil
• 1 can (19 oz/540 ml) black beans, rinsed and drained
• ¾ cup (180 ml) water
• ¼ cup (10 g) chopped cilantro, plus more for garnish
• 3 eggs
• 1 tsp dried parsley
• 2 cups (250 g) bread crumbs
• 6 beef sandwich steaks, about 2 ½ oz (75 g) each
• 3 tbsp (45 ml) canola oil
• 6 kaiser rolls, halved and toasted, if desired
• 2 avocados, cut into small dice and lightly drizzled with lemon juice
• 2 tomatoes, sliced
• Chipotle paste, to taste (see note)