This Tremont taqueria puts the power of the pen in the diner's hand. Guests design their own tacos from a list of some 30 components — from shell to filling to salsa to toppings. The best part: They are all just $3 each. This blissfully informal approach is a great fit for the unpretentious food. In addition to the tacos, the menu features a few starters and sides, not to mention a landslide of tequilas and margaritas. The delightful patio makes a perfect perch to enjoy them.