Vichyssoise

Melt butter in a heavy saucepan over medium-low heat. Add the sliced leeks and a generous pinch of salt. Sweat gently for 10–12 minutes, stirring occasionally, until completely soft, translucent, and sweet-smelling. Do not allow the leeks to color — the finished soup should be ivory-white. Use a lid for the first 5 minutes to steam them faster without browning.

Add the cubed potatoes and pour in the warm stock. Bring to a simmer and cook for 20–25 minutes until the potatoes are completely tender throughout. Do not rush with high heat — a gentle simmer preserves the clean, delicate flavors. The liquid will turn very slightly cloudy as potato starch is released.

Use an immersion blender directly in the pot, or carefully transfer in batches to a stand blender (never fill more than half full with hot liquid). Blend for at least 2 minutes until completely smooth. Pass through a fine-mesh sieve, pressing firmly with a ladle to extract all the liquid and force the vegetable pulp through. Stir in the cold double cream. This sieving step is non-negotiable for the characteristic silky vichyssoise texture.

Transfer the blended soup to a container and refrigerate for at least 1 hour, ideally 4 hours or overnight. Cold temperatures transform the soup — the flavors deepen and meld, and the texture firms slightly to a richer, more velvety consistency. Before serving, taste again — cold soup always needs more salt than warm soup. Adjust seasoning. Serve in chilled bowls with finely snipped chives.