Place the sausages on a tray lined with foil and place under a grill. Cook until golden brown and cooked through
While the sausages are cooking, make the onion marmalade. Heat the oil in a saucepan, add the onions and cook over a moderate heat until browned
Add the sugar and vinegar. Turn the heat down and continue cooking until the liquid has evaporated and the onion marmalade has become a rich dark brown colour. Season to taste
For the crushed peas, bring a pot of salted water to the boil. Cook the peas in the water until tender, approximately 3 minutes. Drain and transfer back to the pan. Add in the butter and cream and roughly blitz with a hand blender
To plate, put a mound of crushed peas on a serving plate and top with the sausages and the onion marmalade
