Cut squash in half and lightly season with salt and pepper; place face-down on a tray and bake in over at 350°F for 45 minutes or until squash is soft.
In a large bowl, add the cooked squash (skin removed) and chopped California Prunes. Stir to combine.
Whisk in one egg and add ½ cup flour, miso paste, hot chili flakes, black pepper, lemon zest and juice, and onions. Mix to combine and adjust seasoning if desired. Adjust flour amount as needed, so that the mixture will hold its shape.
Form fritters into balls with a 2-oz ice cream scoop.
In a large-sized pot, add oil and heat to about 350°F.
Set up your breading station with one bowl each for 1 cup flour, egg and Panko. Bread the fritter by rolling fritters in flour, then egg, then Panko.
Add the fritters to the oil, cooking for a few minutes, then rotating and cooking for another two minutes. Drain and pat dry with a paper towel. Season with Kosher salt. Repeat with remaining fritter batter.
Serve with Prune and Miso Sauce.