Part 1: Preparing the Core Components

1. Sweat the Eggplant (The Most Important Step!): Place the 1/2-inch thick eggplant rounds in a single layer on baking sheets or in a large colander. Sprinkle both sides of each slice generously with the kosher salt. Let the eggplant sit for 30-60 minutes. You will see beads of water form on the surface. This process, called “sweating,” draws out excess moisture and bitterness, resulting in a creamier texture and preventing the eggplant from becoming a greasy sponge when fried.

2. Rinse and Dry: After sweating, thoroughly rinse each eggplant slice under cold water to remove all the salt. Gently pat each slice completely dry with paper towels or a clean kitchen towel. This step is crucial; a dry surface is essential for a crispy coating.

3. Make the Chipotle Mayo: While the eggplant is sweating, prepare your sauce. In a small bowl, combine the mayonnaise, minced chipotle peppers, adobo sauce, fresh lime juice, and minced garlic. Whisk until smooth and fully combined. Taste and adjust seasoning if needed—add more adobo sauce for more heat or more lime for more tang. Cover and refrigerate until you’re ready to assemble the sandwiches.

Part 2: Breading and Frying the Eggplant

1. Set Up the Breading Station: You’ll need three shallow dishes.

   • Dish 1: Whisk together the all-purpose flour, chili powder, cumin, smoked paprika, and black pepper.

   • Dish 2: In the second dish, beat the eggs and milk together until uniform.

   • Dish 3: Pour the Panko breadcrumbs into the third dish.

   • Arrange the dishes in an assembly line: seasoned flour, egg wash, then Panko. Place a clean baking sheet at the end to hold the breaded eggplant.

2. Coat the Eggplant: Working with one dry eggplant slice at a time, first dredge it in the seasoned flour mixture, tapping off the excess. Then, dip it into the egg wash, ensuring it’s fully coated and letting any excess drip off. Finally, press the slice firmly into the Panko breadcrumbs, coating both sides completely and pressing gently to help the crumbs adhere. Place the breaded slice on the clean baking sheet. Repeat with all remaining eggplant slices.

3. Heat the Oil: Pour about 1/2 inch of neutral oil into a large, heavy-bottomed skillet (a cast-iron skillet works wonderfully). Heat the oil over medium-high heat until it reaches about 350°F (175°C). If you don’t have a thermometer, you can test if the oil is ready by dropping a single Panko crumb into it; if it sizzles vigorously, the oil is hot enough.

4. Fry to Golden Perfection: Carefully place 2-3 breaded eggplant slices into the hot oil, being careful not to overcrowd the pan. Frying in batches ensures the oil temperature stays high and the eggplant gets crispy, not soggy. Fry for about 3-4 minutes per side, until deep golden brown and crisp.

5. Drain and Season: Remove the fried eggplant from the skillet using a spatula or tongs and place it on a wire rack set over a baking sheet to drain. Immediately sprinkle with a tiny pinch of salt. Repeat the frying process with the remaining eggplant slices, adding more oil to the pan if necessary and allowing it to come back up to temperature between batches.

Part 3: Assembling Your Mexican Fried Eggplant Sandwich (Torta)

1. Prepare the Rolls: Slice your bolillo or other rolls in half horizontally. Lightly butter the cut sides and toast them in a dry pan, on a griddle, or under the broiler for 1-2 minutes until golden and warm. This adds flavor and prevents the bread from getting soggy.

2. Layer Like a Pro: The order of assembly is key to a great torta. Build your sandwiches on the bottom halves of the toasted rolls in this order:

   • Spread a generous layer of warmed refried beans onto the bottom bun. This acts as a delicious, savory glue.

   • Place two slices of crispy fried eggplant on top of the beans.

   • Immediately top the hot eggplant with two slices of Oaxaca or Monterey Jack cheese. The residual heat from the eggplant will melt the cheese into a gooey, delicious layer.

   • Add a layer of sliced avocado.

   • Top with sliced tomato and shredded lettuce.

   • Add a heaping pile of pickled red onions and fresh cilantro.

   • Slather the top bun generously with the smoky chipotle mayo.

3. Serve Immediately: Place the mayo-slathered top bun onto the sandwich, press down gently, and serve immediately with extra lime wedges on the side for squeezing over the top.