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In a small bowl, whisk together balsamic vinegar, olive oil, Acapulco marinade, garlic, and salt.
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Place portobellos in a large resealable plastic bag. Pour in marinade, seal bag, and toss to coat mushrooms thoroughly. Let marinate at room temperature for 30 minutes.
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Prepare guacamole by adding avocados to a bowl then adding the lime juice, Mexico City sauce and a generous pinch of salt. You can add some fresh cilantro and finely chopped onion if desired.
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Heat a large skillet over medium-high heat. Once hot add tablespoon of olive, then the onion and peppers. Season generously with salt. Cook until softened and slightly caramelized, stirring often, about 5 minutes. Set aside and cover to keep warm.
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Remove mushrooms from marinade. Keep marinade. Using the same skillet, add a dash of oil, then add the mushrooms. Season with a bit of salt and once softened and brown, about 5 minutes, add a spoonful of the marinade for more flavor (optional) and cook for 1 more minute. Remove from heat, set aside and cover.
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Serve portobello fajitas over warm tortillas and garnish with guacamole. Provecho!