To prepare the fritters, grate the zucchini and onion. If you have a food processor, use the grating attachment to do this, which makes it really quick and easy. Transfer to a bowl, sprinkle with the salt, stir really well and leave for at least 30 minutes; longer is okay.
Transfer the mixture to a large sieve or colander and use clean hands to press out the water; alternatively, wrap in a clean dish towel and wring out the water. It is important to get as much water out as possible.
Return the mixture to the bowl. Add the cumin, oregano, thyme, garlic, flaxseeds, lemon zest, garbanzo flour, baking powder and red pepper flakes (if using). Stir together really well so everything is distributed well and you cannot see any dry flour. It will be a very stiff batter. Leave it to rest for 10 minutes. During this time, it will loosen up a little.
Heat a griddle or large skillet over medium heat. Grease with a little oil if it’s not nonstick. Once it’s hot, give the batter a quick stir, and then add it to the pan, using around 1/3 cup (80 mper fritter and leaving about 2 inches (5 caround each one. Use a spoon to flatten the fritters to about ½ inch (1.3 cthick and allow to cook for about 7 minutes each side, or until golden brown. Serve them immediately or keep warm in the oven on its lowest setting while you finish cooking the rest.
You can also bake the fritters in a preheated 400°F (200°C) oven. Line a baking sheet with parchment paper and drop the mixture onto it in roughly 1/3-cup (80-mamounts; then flatten them to about ½ inch (1.3 cthick. Bake for 10 to 15 minutes, flip them and then bake for an additional 10 minutes.
To prepare the avocado crema, cut the avocado in half. Remove the pit and scoop out the flesh into a blender or food processor. Add all the other crema ingredients except the salt and blend until completely smooth. Season with salt to taste. You can adjust the thickness by adding a little more or less water. The olive oil is an optional addition. It makes the crema glossier, but you can easily omit it and add 1 to 2 tablespoons (15 to 30 mof extra water instead.
Serve the hot fritters with a generous dollop of avocado crema.
Leftover fritters keep well for up to 5 days in the fridge. They also freeze really well. They can be reheated in a skillet over medium heat or in the oven. They are also surprisingly good cold! The crema will keep in a sealed container in the fridge for 2 to 3 days.
tip: Enjoy leftover crema as a dip with chips, with tacos, burritos, veggie burgers and sandwiches or thin it out with a little more water or a drop of white wine vinegar to make a great salad dressing!