Wash the Zuchini. Trim the ends; taste-test both ends for bitterness. If bitter, discard- the substance that makes it bitter is toxic. Cut across in half, then slice each half into 3-4 slices
Heat a 10 inch non-stick skillet, add a few drops of oil.
Place the zucchini slices on the pan in a single layer. Do not stack or crowd. Will need to saute the slices in multiple batches.
Sprinkle with salt, cover and cook on medium high heat for 3-4 min
flip one slice to check if it is browned, then flip back. Add 2-3 drops of oil on each slice, then gently flip each slice. cover and cook to brown the other side.
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When the bottom is browned, transfer the slices to a plate, sprinkle generously with papriks and set aside, covered, while browning the next batch of zucchini slices.
Meanwhile, prepare the sourdough slices. Butter each slice, sprinkle with Parmesan, and dot with red chilli paste.
Arrange the zucchini slices, paprika-side up, on the prepared bread slices.
Top with hand-torn fresh basil leaves, if using, then spread mozzararella.
Transfer carefully to parchment-lined baking tray. the parchment helps to release the sandwiches after grilling. Sometimes, the melted cheese drips down the sides, and sticks to the pan, making it difficult to remove the sandwixh after grilling. The parchment paper also helps make clean-up easy.
Bake/grill or broil until cheese melts and begins to brown. Do not over-brown. Transfer to serving plate and serve hot, accompanied by chips, sauteed/steamed vegetables, soup or salad of your choice.
Enjoy!