Grapeseed oil
3 ounces Irish smoked bacon, sliced into chunks
2½ pounds round steak stewing beef, cut into chunks
All-purpose flour
Salt and freshly ground black pepper
1 large Spanish onion, sliced
1/2 small butternut squash (about 6 ounces), roughly diced
2 red peppers, seeded and sliced
One 14-ounce can chopped plum tomatoes
1½ tablespoons tomato paste
2 teaspoons sugar
3/4 teaspoon English mustard powder
1½ cups Guinness, divided
1 bouquet garni (5 sprigs parsley, 1 sprig fresh thyme and 1 bay leaf, tied together with kitchen string)
1 tablespoon butter
Beef stock, as needed