Longeole, with cardon gratin

As tradition built it

Serves 4. 2 to 3 hours' poaching; the gratin bakes 20 minutes.

Ingredients

The longeole

• 1 longeole (IGP)
• 1 or 2 toothpicks
• as needed water

The cardon gratin

• 1 kg Geneva cardons, cooked, from a jar
• as needed butter, for the dish
• 1 tbsp butter
• 1 tbsp flour
• 2.5 dl milk
• 2.5 dl half cream
• 2 pinches nutmeg
• to taste salt and pepper
• 100 g Gruyère, grated
• optional thyme

Method

The longeole

1. Prick each end with a toothpick, and leave it in, to stop the sausage bursting.
2. Poach 2 to 3 hours in water that barely trembles, never above 70°C.

The cardon gratin

3. Heat the oven to 220°C (fan 200°C). Butter a gratin dish and lay in the cardons.
4. Melt the butter, whisk in the flour to a pale roux, and add the milk a little at a time, whisking until thick.
5. Off the heat, stir in the half cream, nutmeg, salt and pepper.
6. Pour it over the cardons, scatter with the Gruyère, and bake 20 minutes in the middle of the oven.

Notes

The poach is the Association Patrimoine Culinaire Suisse's; it describes the sausage as lean pork with about 20 per cent neck fat and 15 per cent raw rind, whole pepper and fennel, and names potato gratin as its classic side. The cardon gratin is Swissmilk's; Denise Gautier's Genevan recipe for ProSpecieRara starts from fresh cardons, peeled into milky water and boiled 30 minutes, and gratinates at 180°C for 20 to 25 minutes. Nouvelles GE poaches the longeole 3 hours in a broth with thyme and bay.

What a modern chef changes

A precise, extended sous vide poach that respects the traditional cooking time exactly, and the cardon gratin rebuilt with the same rind-as-active-surface logic used elsewhere in this chapter

Rungs 1 and 3

Method

1. Poach sous vide at 85°C for the full traditional 3 hours, rather than shortening the time to suit a water bath's precision. The point of the modernist version here is not to speed the dish up, since the raw rind genuinely needs the full duration to render its gelatine properly, but to guarantee the bare-simmer temperature never drifts toward an actual boil, which would toughen the coarse grind in a way the traditional method's careful attention is specifically designed to avoid.
2. For the cardon gratin, treat the vegetable's own fibrous outer layer the way rung 3 treats a cheese rind: strip and discard only the toughest outer strings, but leave the more tender inner ribs with their own slight bitterness intact rather than peeling aggressively, since that bitterness is doing real work against the richness of the sausage and the gratin's cream.
3. Where the genuine longeole cannot be sourced, build an honest homage rather than a claimed equivalent: a coarse, fennel-added Toulouse-style pork sausage, poached, not fried, at the same bare-simmer temperature and duration. State plainly on the plate and in any menu that this is a homage to a Genevan dish, not the dish itself, in the same spirit as this chapter's own sourcing section below.