Chunky Winter Vegetable Soup with Spicy Sausage

225g rindless streaky bacon, cut into 5mm lardons

2 tbsp olive oil

225g onions, chopped

300g carrot, cut into 5mm dice

215g celery, chopped into 5mm dice

125g parsnips, chopped into 5mm dice

200g white part of 1 leek, 5mm  slices thick approx.

1 Kabanossi sausage, cut into 3mm thin slices

400g tin of tomatoes

salt, freshly ground pepper and sugar

1.7 litres good homemade chicken  stock

225g haricot beans, cooked*

To garnish

2 tbsp parsley, freshly chopped

extra virgin olive oil (optional)