Meatballs in tomato sauce with mashed potatoes

Ingredients

• 1 onion, finely chopped
• 2 cloves garlic, chopped
• ½ cup parsley, finely chopped
• 2 slices of bread without crust
• 1 egg
• ½ cup olive oil
• ¼ cup milk
• oil for frying
• salt, pepper, flour for sprinkling
• 1/2 cup olive oil
• 1 handful parsley, finely chopped
• 400-450 g. fresh tomatoes or chopped tomato
• salt, pepper, a little bit of sugar
• 1½ kg washed potatoes (do not peel them)
• 50 g. butter
• 150 g. Kefalograviera cheese
• pepper, nutmeg