Butternut and black bean soft tacos

Ingredients

• 1/2 medium butternut, peeled and cut into 1cm cubes
• 1/2 tablespoon oil
• 1 x 375g jar store-bought taco sauce
• 400 gram canned chopped tomatoes
• 1 teaspoon smoked paprika
• 400 gram black beans, rinsed and drained
• juice of ½ a lime
• small corn or flour tortillas, warmed
• sliced avocado, grated cheese, sour cream and chopped coriander, to serve (optional)