800 g  Lamb Breast , unrolled

2 tbsp  Dijon Mustard

Fresh Parsley , half a small bunch, finely chopped

Chives , half a small bunch, finely chopped

Fresh Mint , half a small bunch, plus extra to serve, finely chopped

1 tbsp  Vegetable Oil

2  Onions , thinly sliced

4  Garlic Cloves , thinly sliced

250 ml  White Wine

250 ml  Chicken Stock