600g forced rhubarb, washed, trimmed and roughly chopped
4 large eggs
200g butter, diced
4 tsp cornflour
175g caster sugar
splash of grenadine (optional)
Put the rhubarb in a blender or food processor and whizz until as fine as it will go. Set a sieve over a bowl, and tip in the rhubarb, pushing pulp with a wooden spoon to get through as much juice as you can.
Add the eggs, butter, cornflour, sugar and 250ml rhubarb juice (save the rest) to a pan and set over a very low heat. Whisk until all the butter has melted, then, using a wooden spoon, stir constantly until the curd has thickened to a consistency a little thicker than custard. Don’t be tempted to increase the heat to speed up the process, as the eggs will curdle; make sure you stir right around the edge, too, as this is where it might catch first.
Sieve the curd into a clean bowl to get rid of any eggy bits that may have curdled. Stir in 100ml more of the reserved juice and a small splash of grenadine if you would like your curd a bit pinker, before chilling. Once cold, taste - add a splash more rhubarb juice if it needs sharpening, then spoon into jars. The curd will keep, stored in the fridge, for up to a week. Eat on scones, crumpets or hot buttered toast, or dollop into sweet pastry cases to make mini curd tarts.