Mix lime zest and juice in bowl (about one whole lime)
Make simple syrup by heating equal parts water and sugar until sugar is dissolved (1/4 cup of each)
Put lime juice and zest in glass and fill 3/4 of the way with cold water
The simple syrup is ready, pour (to taste) into water/lime mixture
Add ice and enjoy! Or...
Pour into a stylish cup, stick in the fridge, and enjoy tomorrow when the limeade is cold and delicious!