Greek Style Smash Gyros

• 500 g lamb or beef mince
• 1.5 red onion, finely diced
• 3 garlic cloves, crushed
• 1 tsp kosher salt
• 0.5 tsp black pepper
• 0.5 tsp dried oregano
• 0.5 tsp paprika
• 100 g tzatziki
• 4 pita bread
• 200 g tomato, diced
• 2 cucumber, diced
• 0.25 cup fresh dill