Candied fruit: Put the fruit in a heavy sauce pan and cover the fruit with cool water. Now place the pan on high heat. Once it comes to a boil, drain. Put the fruit in a bowl of ice water and allow to cool. Now remove the fruit from the ice water and set it aside on a towel.
Place the fruit on a cutting board and trim off both ends of the fruit. In a small saucepan mix together the sugar and orange juice. Bring to a boil over medium high heat. Lower the heat to a simmer. Skim as necessary and add the fruit. Simmer 50-60 minutes, stirring occasionally to make sure the fruit is not sticking to the bottom. Take the fruit out and separate on a plate lined with parchment paper. Reserve and use as desired
For the graham cracker/nut pie crust: Combine all of the above ingredients together in a bowl. Now press them firmly into the bottom and up the sides of a 10-inch pie pan.
Filling: Whip the egg yolks until thick and pale yellow (about 5 minutes). Pour in the condensed milk and the kumquats. Slowly add in the key lime juice. Pour into the pie crust and bake 10-12 minutes.
Cool for 1 hour and then chill completely. Serve as desired.