About 2 months ago I started a Meyer Lemon limoncello (zested lemons & 750mL of Everclear 151). Within about 1 week, the color was a beautiful, clear, brilliant yellow.
Over the weekend I did the 2nd stage: strain out zest, make simple syrup (2 cups sugar to 2 cups water), add lemon juice. Now let it sit for 2 more months. Filled it in a 1.5L bottle of Skyy Vodka. We'll see how it turns out.
For the future I will try:
1. Using good bottled water
2. Filtering using filter paper
3. The Brita filter technique from "LimoncelloQuest"
I had more 151 left over, so I decided to use part of it on an improvised "krupnikas". Added dashes of cinammon, cloves, nutmeg, ginger, whole coriander, whole black pepper, a 1-inch piece of vanilla bean, a tiny splash of vanilla extract, and about 2-3 tbsp. of leftover zest from the limoncello. Can't wait to see how that turns out.