My Mother in Law bought me a bottle of St. Germain. This is the best thing I've made with it so far.
Garnish: Lime wedge & optional salt rim
Method: SHAKE all ingredients with ice and fine strain into chilled glass.
1½ shot(s) Tequila
1½ shot(s) St. Germain liqueur
¾ shot(s) Freshly squeezed lime juice
I didn't salt the rim. That would make it totally crappy.