Add the finely sliced red onions into a jar with pickle juice, let sit for at least 60 minutes.
Preheat the grill to medium-high.
Drizzle the jalapeño, onion slice and corn with olive oil on all sides to coat. Shake chili powder on the corn, optional.
Place jalapeño, onion slice and corn on the grill.
Cook the onion slices until lightly charred on both sides (2 to 3 minutes). Finely dice, then add to a molcajete or large bowl.
Grill the jalapeño until all sides are well charred (6 to 8 minutes). Once charred, place in a small bowl and cover with plastic wrap to sweat. When cooled to touch, peel the charred skin off. Chop finely, then add to the molcajete or bowl.
Grill the corn, turning the ears often so they cook evenly, until lightly charred, about 8 to 10 minutes.
When cool enough to manage, stand each ear of corn, and cut down along the cob to strip off the kernels. Divide in half.
Turn the heat off on half the grill and turn the other half to low. Place a sheet pan of tortilla chips on the side without direct heat, close the lid and heat the chips until warm.
While the chips are heating, add the chopped cilantro, salt, juice of half a lime and olive oil to the molcajete or bowl with the onions and jalapeño.
Mash with a tejolote (pestle) or a fork.
Slice the avocados into halves, remove the seeds, then cut the avocado into cubes and add them into the molcajete or bowl. Juice the last half of the lime over the avocados and mash lightly to incorporate with the other ingredients. Once mashed into the desired consistency, add half of the corn kernels and stir them into the guacamole.
Place the guacamole on a platter and top with the remaining grilled corn, tomatoes, jalapeño slices, onions, and feta cheese. Optional, serve these toppings on the side. Serve with warm chips and enjoy!
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