Mexican Tuna Steak With Avocado Salsa

Ingredients

• 1 tablespoon olive oil
• 1 medium red onion (sliced)
• 1 medium red pepper (capsicum/bell pepper, sliced)
• 1 teaspoon paprika powder
• 1 teaspoon cumin powder
• A good pinch of red chill flakes
• 1 large garlic clove (finely diced or minced)
• 1 tablespoon apple cider vinegar (or other type of vinegar)
• 2 tuna steaks (about 150 g each, 1-cm thick, sourced with sustainability in mind)
• ¼ tsp black pepper
• ½ tsp salt
• 1 tablespoon butter
• 1 teaspoon coriander seeds (or coriander seeds powder)
• 1 lime (zest + juice)
• 1 large avocado (ripe, chopped)
• 2 tablespoons fresh cilantro (coriander) (chopped, )
• 1 tbsp lime juice (about half a lime)
• ⅓ salt