Transfer to a medium bowl and add zucchini and onion, parsley, and lemon zest
Toss with a rubber spatula to combine
Line a rimmed baking sheet with paper towels; set a wire rack inside
Heat ghee in a medium cast-iron skillet over medium-high until a pinch of batter added to the pan sizzles and sputters
Using a large spoon, scoop out about ¼ cup batter, then use a second large spoon dipped in the hot ghee to carefully scrape into pan; flatten with ghee-coated spoon
Repeat to make 3 more fritters
Fry until deep golden brown underneath, about 3 minutes
Turn over with a wide slotted spatula and fry until deep golden brown on the second side, about 3 minutes
Transfer fritters to prepared rack to drain; season immediately with salt
Repeat with remaining batter (you end up with 8–10 fritters total)