1. 1. Preheat the oven to 375°F (190°C).

2. 2. Boil the potatoes and sweet potatoes until they are tender. Once cooked, peel and slice them.

3. 3. In a pan, cook the minced garlic, fresh onion, and minced meat until browned. Add the tuna and pasta sauce, then simmer for 5 minutes.

4. 4. Layer the sliced potatoes in a baking dish followed by the tuna mixture. Repeat the layers until all ingredients are used up.

5. 5. Whisk together eggs, 1% milk, and white sugar in a bowl. Pour this mixture over the casserole in the baking dish.

6. 6. Bake in the preheated oven for 30-35 minutes or until the top is golden brown and the casserole is heated through.

7. 7. Serve hot with a side of basmati rice or bread slices.

8. 8. Enjoy your Tuna and Potato Casserole!