Tex Mex chicken tacos

Ingredients

• 1 Tbsp (15ml) oil (olive, canola or sunflower)
• 1 Tbsp (15ml) butter
• 400g skinless, boneless chicken breasts, cut into strips
• Salt and freshly ground black pepper
• 1 tsp (5ml) chicken spice (see Cook's Note)
• 2 red onions, chopped
• 2 Tbsp (30ml) Peppadew chutney (or chutney of your choice)
• 1 x 400g tin black beans (or beans of your choice), rinsed and drained
• 1 x 400g tin tomatoes, chopped
• 1 handful of fresh coriander or parsley, chopped
• 8 taco shells
• ½ a lettuce head, shredded
• 1/2 cup (125ml) sour cream
• Juice of 1 lime (or lemon)
• 1 avocado, peeled, pitted and diced
• 1 cup (250ml) grated cheddar cheese