Step 1

Have ready a fine-mesh sieve placed over a heat-proof bowl.

Step 2

In a medium, heavy bottomed saucepan, melt the butter over medium heat.

Step 3

Add the berries and any juices, sugar, grapefruit juice, egg yolks and salt.

Step 4

Cook over medium, stirring frequently and mashing the berries, until thickened, about 5-10 minutes.

Step 5

Strain through the prepared sieve, mashing the berries with a spoon.

Step 6

Discard the seeds and other solids.

Step 7

Give the curd in the bowl a stir, let cool slightly and press plastic wrap onto the surface.

Step 8

Cover and refrigerate until completely cooled.