Carmela’s lasagna di melanzana (eggplant lasagna)

Lightly browned eggplant is the vegetarian filling for this traditional Italian lasagne.   Ingredients (serves 8): 1 tbs olive oil 1 brown onion, finely chopped 1 x 660ml btl passata (tomato pasta sauce) 125ml (½ cup) water 3 large (about 1.3kg) eggplants cut crossways into 3mm-thick slices 2 tsp salt Olive oil spray 1 x…