Preheat oven to 350 degrees. While waiting for oven to preheat, crush one package (8 crackers) of graham crackers in a medium sized bowl. Add sugar and stir until well blended. Add melted butter and use a fork to toss ingredients until all crumbs are moist. If your mixture is too crumbly, add one more tablespoon of butter to moisten. Press graham mixture into a 9 inch pie plate. Bake crust for 10 minutes and remove immediately to cool on the counter. Turn oven down to 325 degrees.

In a medium sized bowl, pour in sweetened condensed milk, lime juice and whisked yolks. Using a hand mixer on low speed, mix until well blended. If mixture isn't tart enough, add a bit more, until desired tartness is achieved. Pour filling mixture into cooled pie crust and bake at 325 degrees for 20 minutes. Let cool for 15-20 minutes and then transfer to refrigerator until time to serve. Pie is ready to serve when filling is well set. For best results, allow pie to cool for at least 2 hours. Do not freeze.

Serve cold and garnish with whipped cream, zest of lime or crushed graham crackers. This recipe can be made more or less sweet by choice of ingredients. Use honey graham and packed light brown sugar for a sweeter version. Choose the plain graham crackers and white sugar if you prefer a less sweetened version.