1. Peel the potatoes and boil them in salted water until tender.
2. Hard-boil the eggs for 9-10 minutes, cool them in cold water and peel.
3. Lightly toast the flour in the butter, then gradually whisk in the stock and milk.
4. Simmer for 5 minutes until thickened, then stir in the cream and mustard; season with salt, white pepper and a pinch of sugar.
5. Halve the peeled eggs and place them in the hot sauce to warm through - don't let the sauce boil again.
6. Serve with the potatoes and sprinkle generously with chives.
Tip: Use a medium-hot mustard - it mellows slightly as it cooks but keeps its flavour.
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