200 g (7 oz) 7/8 cup butter
4 x 250 g (9 oz) veal cutlets, trimmed
1 large onion, sliced
2 apples, peeled, cored and sliced
175 g (6 oz) button mushrooms
1 tbsp chopped fresh tarragon
8 black peppercorns
1 tbsp sesame seeds
400 g (14 oz) dried marille
100 ml (3 1/2 fl oz) scant 1/2 cup extra virgin olive oil
175 g (6 oz) 3/4 cup mascarpone cheese, broken into small pieces
2 large beef tomatoes, cut in half
leaves of 1 fresh basil sprig
salt and pepper
fresh basil leaves, to garnish