you need really high tubes...this would probably work but it would be fiddly
Trot to the supermarket and buy the tallest tins of canned food that you can find..foreign wurst type canned sausages are in tall narrow cans. Buy one more can than you need. Remove the contents and cut out both ends of the can. Remove any paper labels. Wash thoroughly and allow to dry. Line each can with a roll of silicone paper, the kind that has one side foiled would be easiest. cook the lasagne and very carefully fit a piece into the bottom of each can with the edges tucked up inside the can. This will be the base and minimise leaks. Set the base lined cans on an oiled non stick baking sheet. Use the spare can to cut out circles of lasagne pasta. layer up the cans with ragu, cheese sauce and pasta as usual. You will need to make the sauces a bit dryer than usual to get the tower to stick together so have extra cheese sauce and ragu to serve on the side. Bake in the oven. Set each can on your serving plate, cross everything, slide off the can and peel off the liner. et viola!