quart lightly salted water
plus 2 tablespoons fresh squeezed lime juice
oyster or Portobello mushrooms, finely chopped
hearts of palm, drained and finely chopped
medium red onion, finely chopped
chopped fresh cilantro, plus several sprigs for garnish
clove garlic, minced
cucumber, peeled and finely diced
jicama, finely diced
Roma tomatoes, finely diced
small avocado, peeled, pitted, and cubed
Salt and pepper, to taste
Several lime slices, for garnish
Crackers or tortilla chips, for serving
Bring 1 quart salted water to a boil and add 2 tablespoons of the lime juice. Add mushrooms and hearts of palm, cover and return to a boil. Immediately remove from heat and drain water. Cover with the lid and set aside, letting mushrooms and palm hearts steam in closed pot for 10 minutes.
Drain mushrooms and palm hearts again to remove remaining liquid and put in large bowl to cool completely. Toss with remaining 1/2 cup of lime juice, cover and refrigerate for about 1 hour.
In a small strainer, rinse chopped onion under cold water, then shake off excess liquid. Add to mushroom and palm heart bowl along with chopped cilantro, garlic, olive oil, cucumber, jicama, tomato, and avocado. Mix gently and season with salt and pepper. Cover and refrigerate up to 3 hours. Spoon the ceviche into martini glasses or small bowls. Garnish with sprigs of cilantro and slices of lime. Serve with crackers or tortilla chips.