Image courtesy of acme Dish of the Week: Ma po tofu Ma po tofu is a classic Szechuan dish that includes Szechuan peppercorns, tofu, and ground pork or beef long simmered in a claypot. The Szechuan peppercorns lend an unusual hot-numbing spice, as well as a slightly grassy flavor. Many variations have evolved from that original dish that eliminated or substituted the peppercorns, the meat or the claypot. It’s also common to go to…