Pat Whelan’s Ossobuco

8 slices beef shin, cut at least 2.5 cm thick

plain flour seasoned with salt and pepper

85g butter

2 tbsp olive oil

1 medium onion, peeled and finely chopped

3 celery stalks, chopped

2 medium carrots, peeled and chopped

4 garlic cloves, peeled and finely chopped

1¼ cups white wine

1 tin of chopped tomatoes

300ml chicken stock

3 tbsp parsley, finely chopped

finely grated zest of 1 lemon