Bangers and mash with crisp onion and hot English mustard

1.Cook potato in boiling salted water until tender (12-15 minutes). Meanwhile, heat cream, milk, butter, garlic and half the thyme in a small saucepan over medium heat until hot. Drain potato, return to pan, mash until fluffy, strain cream mixture over (discard solids), stir until smooth, drizzle with melted butter, season to taste and keep warm.

2.Heat oil in a large frying pan over medium-high heat until very hot. Add half the onion, stir occasionally until golden and crisp (1-2 minutes), remove with a slotted spoon, drain on absorbent paper and repeat with remaining onion. Add remaining thyme, fry until crisp (30 seconds), then drain on absorbent paper. Drain oil, leaving 20ml in pan, then add sausages and turn occasionally until golden and cooked through (6-7 minutes). Scatter sausages with onion and thyme and serve hot with mash and hot English mustard.