My Mom's Key Lime Pie

Note: Mom, I tried this and just found it too sweet for my taste.

l C. dry milk
3/4 C. sugar
l/3 C boiling water
2 T. melted and cooled butter
Blend in blender slowly adding water. Blend till smooth.

Then add:

3/4 C. fresh lime or lemon juice
l egg
l T. zest and a couple T. yellow food coloring.
Blend this a minute or so till nice and fluffy.

Pour in a smaller graham cracker filled pie plate, precooked.
Bake at 350/ 30 min. Garnish top with more zest before baking.
Chill before serving.