Slice the aubergine and grill for 1-2 minutes on each side.
Prepare the tomato sauce (as a base you could use homemade tomato sauce): saute garlic and onions. add olive oil, tomato sauce, basil and oregano.
Preheat the oven 365F.
To assemble vegan parmigiana, add some tomato sauce to the button of baking dish, top it with grilled aubergine, tomato sauce, vegan cheese. Then repeat the layers. Finish the top layer with tomato sauce and vegan cheese.
Bake 25-30 minutes until golden brown on the edges.