Chargrilled tuna with summer herb crust

Ingredients

• 4 tuna steaks ((about 150 grams/5 oz each))
• 1 garlic clove (crushed)
• 2 tbsp olive oil
• 1/3 cup dry white wine
• 3/4 cup ciabatta breadcrumbs
• 1/4 cup pine nuts
• 2 tbsp fresh basil (chopped)
• 2 tbsp fresh flat-leaf parsley (chopped)
• 1 3/4 oz sun-dried tomatoes (drained and chopped)
• 1 lemon (zest grated and juiced)
• 4 beefsteak (or other large tomatoes)
• 8 large basil leaves
• 1/2 lb baby spinach leaves