To make the sauce simply place all ingredients in a bowl and whisk until combined. Store in fridge until ready to serve.
Line baking sheet with paper towels. Bring a medium saucepan of salted water to boil and add spinach. Stir until wilted then drain through a sieve. Rinse under cold water to stop the spinach from cooking. Transfer to the prepared baking sheet, spread out and let dry for at least 5 minutes. Finely chop spinach, the place in large mixing bowl and set aside.
Place peas in a food processor, pulse until roughly crushed, and then add spinach along with preserved lemon, chile, eggs, ricotta, cornstarch, za'atar, chile flakes, cardamom, aniseed, mint, parsley, dill, 1 tsp salt and a few grinds of cracked black pepper.
Preheat oven to 400 F. Line a plate with paper towels, and a baking sheet with parchment paper.
Pour the oil into a large frying pan and and place over medium heat. Once hot, use two small spoons to scoop up the mixture, approximately 3 inches wide and 3/4 inch thick. Carefully lower into oil - you should be able to fit 3 fritters at a time. Fry 3-4 minutes, turning once to brown both sides.
Transfer fritters with a pancake flipper to prepared plate while you continue cooking remaining fritters. Once they are all fritters, lay the fritters out on the prepared baking sheet and bake for 4-5 minutes.
Serve warm with the sauce and wedge of lemon for spritzing.