Grill the bell peppers, chiles, tomatoes, onion, and garlic over a charcoal grill until softened.
Place everything in a bowl and cover briefly with plastic wrap.
Peel and chop the vegetables.
Mix the vegetables with 1 tbsp olive oil, lemon juice, spices, and season with salt and pepper to taste.
Arrange the salad on a deep plate or shallow bowl, drizzle with the remaining oil, and serve with the tuna and eggs cut into eighths. Sprinkle capers and olives on top.
Notes
If you don't have a grill, you can also broil the vegetables. Simply place them on a baking sheet and broil in the oven at 400°F.