1 medium bunch cilantro, thick bottom stems cut off (1 cup packed)
1 small bunch flat-leaf parsley, thick bottom stems cut off (1 cup packed)
1/2 olive oil
salt
1/4 fresh lime juice, plus more if needed
1 1/2 sashimi-quality skinless, boneless fish fillets, such as alaskan halibut or ahi tuna, cut into 1/2-inch cubes
7 small pickling cucumbers or persian (baby) cucumbers, cut into 1/2-inch cubes
salt, if needed
2 ripe large avocados, pitted, flesh scooped from skin and cut into cubes
lettuce leaves, preferably butter lettuce, for garnish
Directions
Set a dry skillet over medium heat. Lay in the unpeeled garlic cloves and chiles. Roast, turning frequently, until they are soft and blotchy brown in spots, about 10 minutes for the chiles and 15 minutes for the garlic. Cool until easy to handle, and then slip the skins off the garlic, pull the stems off the chiles, and roughly chop (no need to remove the seeds). Put them in a food processor along with the cilantro, parsley, oil, and 2 generous teaspoons salt. Process until nearly smooth (it will be pasty). Scrape the mixture into a storage container and refrigerate until serving time.
In a large bowl, whisk together the lime juice and 1/2 cup of the herb seasoning. (Cover and refrigerate the remainder for another preparation.) Add the fish and cucumber, and stir to combine. To blend the flavors, cover and refrigerate for 1/2 hour (for best results, no more than 1 hour). Taste and season with a little more lime juice or salt if needed, then gently stir in the avocado (save a little for garnish if you want). Serve on plates or in martini glasses lined with lettuce leaves.