Tuna Pasta with Burrata

Ingredients

• Salt
• 1 box (16 ounces) pasta, such as strozzapretti shape
• 2 tablespoons olive oil
• 1 large onion, cut into small dice
• 1 can (28 ounces) tomato puree
• 1 to 2 cans (7 ounces each) tuna packed in olive oil
• 1 large ball (about 8 ounces) buratta