400 g white Mercer mushrooms, sliced

1 onion, finely chopped

6 tbsp butter

2 tbsp olive oil

⅔ cup plain flour

1 head of broccoli, chopped

3 vegetable stock cubes

1.6 litres milk or cream (or a mix of both)

1 cup grated cheese

1 tsp salt

¼ tsp black pepper