Cut your bagels in half.
Toast the outside of each bagel half under a medium grill until golden brown.
Mix together your tuna, sweetcorn, red onion and mayonnaise in a large bowl.
Spread the tuna mix equally between the 8 bagel halves.
Top with grated mozzarella and grill until the cheese is golden and bubbling.
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Calories: 561kcal | Carbohydrates: 77g | Protein: 36g | Fat: 12g | Saturated Fat: 6g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 3g | Trans Fat: 0.01g | Cholesterol: 57mg | Sodium: 1116mg | Potassium: 521mg | Fiber: 5g | Sugar: 8g | Vitamin A: 454IU | Vitamin C: 7mg | Calcium: 227mg | Iron: 3mg