- 15 ounce trimmed rhubarb, sliced into 3cm (just over 1 inch) lengths
- 6 ounce caster sugar (superfine sugar)
- 2 cup double cream or whipping cream
- juice of 2 large lemons
- 1 cup softly whipped and sweetened to taste with a little powdered sugar
- Preheat the oven to 320 degrees F.
- Put the rhubarb and half of the sugar in a bowl, mix, and leave to macerate for 20 minutes.
- Spread the rhubarb (including all the sugar from the bowl) in a single layer over a shallow roasting tray and bake for 25 minutes until very soft (it may take less if your rhubarb stalks are thin).
- Spoon the rhubarb and its juices into a food processor and blend. Pass through a sieve, pushing it through with a spoon to extract as much liquid as possible. Discard any rhubarb left in the sieve, and then cool the purée completely.
- Put the cream and remaining sugar in a high-sided saucepan and bring slowly to a boil, dissolving the sugar. Turn down the heat (to prevent it from boiling over) and bubble gently for 3 minutes.
- Remove from the heat and stir in the lemon juice, followed by the rhubarb puree.
- Pour equally among 6 glasses or 2/3-cup ramekins.
- Cover with plastic wrap and chill for at least 3 hours or overnight.
- When ready to serve, add a dollop of softly whipped, sweetened cream.