Set your oven 375°F , make your meat balls ,

You start giving your meatballs a little cup shape, using your palm

Place your meatball cups in a greased baking dish. Put in the freezer, you boiled the potatoes, start peeling them. Mash them. Remove your "cups" transfer the oven, until they are changing color to get cook, in this point remove them, bc we will return them into the oven soon

Fill the cups with potato mixture. Add little bit of Parmesan , over each potato cup, Return them to the oven about 20 minutes, then turn on the broiler

When potato purée get the right color remove them.

Mix tomato paste with 1 cup of hot water, pour evenly into the cups. Cook 15 minutes

When you serve get sauce from pan, pour over cups.. Delicious !