In our house, Friday nights are Burrito night.  My oldest son has his dance class and, afterward, he and I go pick up burritos in the mission.  Naturally, after dancing enthusiastically for an hour, he’s worked up a powerful thirst.  Sometimes, therefore, I’ll get an agua fresca — a Mexican fruit drink — for him while our food is being made.  Last night, however, he got a lesson instead.

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