Too Easy Beef Tacos

• 1 tbsp extra virgin olive oil
• 500 g lean beef mince
• 400 g black beans, drained
• 2 tsp Mexican spice mix
• 1 avocado
• 0.5 cup plain greek yoghurt
• 1 tbsp lime juice, freshly squeezed
• 2 cup iceberg lettuce, shredded
• 250 g cherry tomatoes, halved
• 250 g mini Tortillas (Wholemeal)