Preheat the oven to 200°C/400°F. Line a baking sheet with parchment paper and coat the paper with cooking spray.Make the tomatokeftedes. In a large bowl, add all the ingredients. Using your hands to partially crush the tomatoes,combine the ingredients until the mixture is thick and sticky. (If needed, add more flour and/or water.) Form tomatokeftedes about the size of a golf ball; you should have about 6. Place them on the baking sheet and press down slightly to form patties.Bake for 10 minutes, flip them over, and bake for another 10-15 minutes or until browned on the outside and firm.Make the tabouleh.Pat dry the cucumber noodles to remove moisture.Pulse the cauliflower florets in a food processor until rice-like. Add the onion, parsley, mint, salt and pepper,lemon juice, and zest to the food processor and pulse until well combined.Prepare the tzatziki. Whisk the ingredients in a medium bowl.Assemble the meal. Combine the cucumber noodles and the tabouleh mixture in a large bowl and toss to blend well. Divide into serving bowls and top with hot tomato balls. Drizzle over the tzatziki sauce and serve.