In a large pot bring 6-7 cups of salted water to a boil. Add cauliflower and the bay leaf. Boil 8-10 minutes or until cauliflower is fork tender. Do not drain!
Transfer cauliflower from water to a large bowl and set aside. Discard the bay leaf and reserve 1-2 cups of the cooking liquid. Return the rest of the liquid to the pot and save for later. (will be used to cook the pasta)
In a large fry pan over medium high heat add 1 tsp olive oil. Once oil is hot add onions and cook till translucent, 5-7 minutes.
Add garlic and cook 1-2 minutes more until garlic is fragrant. Remove 1/4 cup of the onion and garlic mixture and place into the bowl with the cauliflower.
Add the carrots and celery to fry pan with remaining onion and garlic, salt to taste, and cook down 3-5 minutes until carrots are just tender.
Add spinach, salt to taste, and cook until wilted. Remove the fry pan from heat.
Time to bring the pot of water back to a boil. Once boiling add lasagna noodles and cook according to package directions. (Be careful here, rice noodles tend to be done in less time than the package states, and these will be baked to continue cooking as well. I did about 2 minutes less than the package said.)
Preheat oven to 350F
Meanwhile in blender/or with a stick blender, blend the cauliflower onion and garlic mixture adding 1/2 cup of reserved liquid at a time until desired consistency is reached, salt to taste.
Drain the noodles and toss with just a little olive oil to keep them from sticking together.
Time to assemble! In a large baking dish, (12x8x3) place a thin layer of the cauliflower sauce followed by a layer of noodles. Next add a layer of zucchini, a layer of mixed veggies, and repeat three times finishing with noodles and sauce.
Bake covered 30 minutes. Let sit 10 minutes before slicing and serving.
Salt is very important in this dish! Salt everything well and you’ll be sure to have a flavorful dish!