Tuna sous vide on tomato relish

Ingredients

• 2 Albacore tuna steaks (150 g each)
• 2 tbsp olive oil
• Zest of an organic lime
• 2 garlic cloves, finely sliced
• 400 g cocktail tomatoes, finely chopped
• 1 red onion, finely diced
• 1 small red bell pepper, very finely diced
• 1 red pepper, finely chopped (seeded to taste)
• 1 garlic clove, finely chopped
• 40 ml red wine vinegar
• 2 tsp sugar
• 1 tsp salt
• Freshly ground black pepper
• 1-2 tsp lime juice (to taste)
• 3 tbsp olive oil
• 1 pinch of Piment d'Espelette
• Fresh basil leaves