Lightly oil the skewers. Wash the tomatoes and drain well. Peel onion and garlic. Cut onion into fine slices, chop garlic. Wash the basil, shake dry and pluck the leaves
Dab the meat dry and beat it flat between 2 cut open freezer bags. Season cutlets with pepper and sprinkle with parmesan. Cover each cutlet with 2 slices of ham, place 2-3 basil leaves on each narrow side and roll up from this side. Roll up cutlets lengthwise. Cut the rolls into 4 thick slices and distribute them on 8 skewers.
Bring stock, little salt and fat to the boil, stir in polenta and bring to the boil. Let simmer for about 5 minutes while stirring. Remove the pot from the stove and put aside covered
In the meantime, heat the oil in a large pan and fry the skewers for about 6 minutes, turning them over. Place on a preheated plate and cover with aluminium foil
Add onions, garlic and tomatoes to the hot frying fat and fry for 4-5 minutes, turning. Stir in sugar and vinegar, heat up briefly. Fold in remaining basil, season with pepper and coarse sea salt. Season polenta with nutmeg and arrange on 4 plates with the skewers. Spread the braised cherry tomatoes on top