Mediterranean tuna pasta - Recipe - Marché Adonis

Ingredients

• 375g spahgetti
• 2 onions chopped
• 2 garlic cloves
• 1 swiss chard or spinach bunch
• 3 tbsp olive oil
• 3 tbsp black pitted olives, chopped
• 2 cups strained tomatoes
• 1 can of tuna
• Salt and pepper