For those of you who bemoan D.C.’s lack of authentic Mexican food, this week is your chance to break the cycle of bad Tex Mex and sugary margaritas. The Mexican Embassy and Mexican Cultural Institute are hosting “A Taste of Mexico in DC”, a week-long tribute to Mexican food and culture. The festivities started on Saturday at the Mexican Cultural Institute open house. Activities included cooking demonstrations, lectures, live music, and several free food and…