Boil the potatoes until tender, then mash
Sauté the leeks in 1 tbsp olive oil until soft, about 15-20 minutes
Mix the leeks, mashed potato, flour and egg. Season well and shape into 8 patties
Heat the remaining olive oil in a pan and fry the patties for 3–4 minutes on each side until golden. Keep warm
For the mustard sauce, whisk together the mustards, crème fraîche, lemon juice and honey. Set aside
Bring a pan of water to a gentle simmer, add the vinegar and swirl the water. Crack in the eggs and poach for 3 minutes. Remove with a slotted spoon
Place two potato cakes on each plate, top with a poached egg, drizzle with mustard sauce and garnish with fresh chives and capers
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