Cilontrastic Syrup

I don't normally post recipes without booze in them, but here's a rare and deserved specimen.  Friends, I present to you: tequila's best friend ever.

8 oz agave nectar
4 oz water
1 teaspoon whole coriander seeds
1/2 cup chopped cilantro
Zest of 2 limes

Heat the agave, water, and coriander in a small saucepan over low heat until the syrup comes to a gentle simmer.  Add the cilantro and lime zest, remove from heat, cover, and let sit on the stove to infuse for an hour.  Pour through a fine sieve and keep refrigerated in a sealed container.  Optionally, add 1/2 oz of 100-proof (or higher) vodka for longer storage - though note that this technically makes it non-alcoholic.

My favorite usage thus far:

2 oz blanco tequila
1/2 oz Cilontrastic Syrup
1/2 oz lime juice

Shake and strain into an old-fashioned glass over crushed ice.

This works equally well with other robust white spirits, like white rum or pisco.