On a Mexico City street food tour

Jess Federly tries out an octopus tostada during the Eat Mexico street food tour in Mexico City.

An octopus tostada comes together during the Eat Mexico street food tour in Mexico City.

Ubish “Arturo” Yaren, far left, from Eat Mexico, leads a Mexico City street food tour group that includes Jess Fedderly, leaning on the wall from left, Matt Fedderly, Silas McRae, Samantha Bellamy and Sarah Rothstein.

Matt Fedderly tries out a burrito with squash blossoms during an Eat Mexico street food tour in Mexico City.

The Eat Mexico street food tour stops at a fruit and juice stand in Mexico City.

Cemita sandwiches are made and served during the Eat Mexico street food tour in Mexico City.

A stop on the Eat Mexico street food tour in Mexico City.

Visiting a tortilleria, where corn tortillas are made, during an Eat Mexico street food tour group.

Ubish “Arturo” Yaren, far right, from Eat Mexico, leads a Mexico City street food tour group composed of Silas McRae, from left, Samantha Bellamy, Jess Fedderly, Matt Fedderly, and Sarah Rothstein.

Anais Martinez leads Brenda and Ken Black on a food tour through La Merced Market in Mexico City.

Brenda and Ken Black joke around with a food vendor at La Merced Market during their Eat Mexico food tour in Mexico City.

A walk through the meat section at La Merced Market in Mexico City.

Osvaldo Fuentes prepares fresh meat that is stored in a cargo truck to be delivered to a storefront inside La Merced Market while his daughter, Carmen, 7, spends time with him during the Easter school holidays in Mexico City.

Lime is squeezed over tacos de cabeza at La Merced Market in Mexico City.

Ox-head tacos, aka tacos de cabeza, are served at Armando Garcia’s stall during a food tour through La Merced Market led by Anais Martinez.

Tacos de cabeza are served at Armando Garcia’s stall as Anais Martinez leads a food tour through La Merced Market in Mexico City.

Tacos de cabeza are served up as Armando Garcia, left, pulls the meat from the source itself, during a food tour through La Merced Market in Mexico City.

Anais Martinez of Eat Mexico leads Brenda and Ken Black on a food tour through La Merced Market in Mexico City.

At the pre-Hispanic food section, Anais Martinez of Eat Mexico offers Brenda and Ken Black some maguey worms, a type of caterpillar that lives in maguey plants, during a food tour through La Merced Market in Mexico City.

At the pre-Hispanic food section in Mexico City’s La Merced Market, Anais Martinez of Eat Mexico displays an edible maguey worm, a type of caterpillar that lives in maguey plants.

Anais Martinez of Eat Mexico offers Brenda and Ken Black some crawfish at the pre-Hispanic food section during a food tour through La Merced Market in Mexico City.

Anais Martinez of Eat Mexico shows a large dried ant available for consumption at the pre-Hispanic food section of the La Merced Market in Mexico City.

Anais Martinez of Eat Mexico offers Brenda and Ken Black a type of tamale made with fish, before pork and lard were introduced by the Spanish, during a food tour through La Merced Market in Mexico City.

Anais Martinez of Eat Mexico explains the types of mushrooms and corn fungus to Brenda and Ken Black on a food tour through La Merced Market in Mexico City.

Several varieties of mole, a sauce used in Mexican cuisines, are on sale in a food stall at Mexico City’s La Merced Market.

Anais Martinez of Eat Mexico shows different types of chile peppers to Brenda and Ken Black during a food tour through Mexico City’s La Merced Market.

Anais Martinez of Eat Mexico, from right, Brenda and Ken Black try the tacos de suadero on a food tour through La Merced Market in Mexico City.

Tacos de suadero are served at the La Merced Market in Mexico City.

Deep-fried tamales as seen during an Eat Mexico food tour through Mexico City’s La Merced Market.