Preheat oven to 360 degrees F (or approximately 180 degrees C).
Steam pumpkin and onion until tender or microwave on High (100%) for 4 – 4 ½ minutes, covered in a bowl.
Puree pumpkin and onion with garlic and ricotta cheese. Season to taste with freshly ground pepper.
Layer lasagna and pumpkin filling alternately in a lightly greased 9 x 13 inch (or approx 20 x 30cm) baking dish, finishing with lasagna.
Mix tomato with basil and cover with lasagna evenly.
Sprinkle grated cheddar or mozzarella cheese on top.
Cover baking dish with aluminium foil.
Bake in preheated oven for 30 minutes.
Remove aluminium foil and continue to bake lasagne for another 5 minutes.
Remove from oven, slice and serve while hot.
Notes
There are countless ways to accommodate your own tastes into this versatile lasagna recipe. Check out the 'options' heading (below) for some suggestions.