1 1/2cupsfreshly squeezed pink or ruby red grapefruit juice, (not bottled!) strained to remove seeds and pulp
1/4cupfreshly squeezed lemon juice
tiny drop of pink gel food coloring
5Tbspbutter, cut in 5 pieces
Preheat oven to 350F
Put the gingersnaps in a food processor and process until they are fine crumbs (This should be about a heaping cup, in case you're using ready made crumbs) Add the walnuts, and sugar and process again until everything is finely ground. Add the butter and process briefly to combine.
Pat the crust into a 9 inch pie plate, and up the sides. Bake for 10-12 minutes. Set aside to cool.
Put the sugar, cornstarch, salt, and egg yolks in a saucepan with a heavy bottom and whisk to combine and break up the yolks. Whisk in the juices and add the tiniest bit of food coloring to enhance the pink tone. Less is more when it comes to the coloring, and the pink will deepen as the curd thickens.
Heat the mixture on medium heat, whisking or stirring constantly, until it comes to a boil. Boil for one minute exactly (set the timer.)
Take off the heat and whisk in the butter pieces, the mixture will be thick and glossy.
Strain the curd though a mesh strainer if you like, the step is optional, but will remove any little bits of curdled egg. Fill the pie shell immediately, the curd will start to set fairly quickly.
Let cool and then refrigerate, uncovered, at least 4 hours to let it fully chill and firm up.
https://theviewfromgreatisland.com/grapefruit-gingersnap-pie-recipe/ December 15, 2017