Make the MornayTear the bread into smaller pieces and turn to crumbs by crumbing for 5 seconds on speed 8. Set aside.Add the cubes of cheese to the TM bowl and grate for 10 seconds on speed 8. Set aside.Add the clove of garlic to the TM bowl and chop for 3 seconds on speed 7. Add the onion and chop for 3 seconds on speed 5. Add butter and saute for 5 minutes / 100° / speed 1.Add the flour, milk and veggie stock paste and cook for 7 minutes / 90° / reverse / speed 4.Now with the blades turning on reverse / speed 2 add the spinach, tuna and lemon juice and HALF of the reserved grated cheese through the hole in the lid over a 2 minute period until gently combined. Pour the mornay into ThermoServer while you make the bechamel sauce.Make the Bechamel Sauce toppingGive the TM bowl a quick rinse but don't worry about making it immaculately clean. Add all the bechamel ingredients into the TM bowl and cook for 5 minutes & 30 seconds / 90° / speed 4. Set aside.Make Lasagna SheetsFollow instructions for making the pasta dough in the cookbook that came with your Thermomix.Using a pasta maker (I have a manual one and find it so therapeutic to turn the handle. ha!) Start with number one (using a small piece of dough) and continue folding the dough into thirds and turning the number up one knotch at a time going all the way to the thinnest setting possible - for me that's number 7). Assembling the LasagnePreheat the oven to 200°.Grease your lasagne dish with butter or oil and line the base with one layer of lasagne sheets. Spread one third of the mornay sauce over the lasagne.Repeat the layers another two times, finishing with a layer of lasagne sheets.Pour the bechamel topping sauce over the top and sprinkle with bread crumbs and the remainder of the grated cheese. Cover with alfoil and cook for 20 minutes in preheated oven. Remove alfoil and continue cooking for another 20 minutes or until the top is golden and crunchie. Enjoy with homemade garlic bread and a salad.