Wash and slice up all of the vegetables.
Mix the water and vegetable stock cube together, and bring to the boil in a pan.
Add the vegetables and simmer for 10 minutes.
Place flour, butter and milk in another pan, heat and whisk continuously until the sauce thickens and is nice and smooth.
Place half the cooked vegetables into an ovenproof dish (this recipe recommends a 10×8 inches dish).
Cover with half of the lasagne sheets, half of the sauce and a sprinkle of the grated cheese.
Repeat to make another layer.
Top with the remaining sauce and a sprinkle of cheese.
Bake in the oven at 190°C or Gas Mark 5 for 35 minutes until the top is golden.
Serve with a delicious green leaf salad!