Toss the flour with the sugar, cornstarch and salt and then drizzle in the melted butter until the mixture becomes crumbly. Make sure all the flour gets moistened. Pat the crust into a 9 inch tart pan with a removable bottom. Press it up the sides of the pan. Prick the bottom of the dough all over with a fork. Bake for 12 minutes. Set aside.
for the filling
Put a layer of onions on the bottom of the crust. Mix the cheese and mayo and spread it over the onions. Top with the zucchini, layering them in a spiral pattern.
Sprinkle with salt and fresh cracked black pepper. Top with the cheese and the cracker crumbs.
Tent loosely with foil and bake for 20-25 minutes until the cheese is bubbling and browned. If necessary you can run it under the broiler at the end for more color.
Serve hot with a sprinkle of fresh thyme.
Notes
Use young slender zucchini and make sure you slice it very thinly.
I went easy on the cheese because I wanted some of the zucchini to show in the photos, but you can add more if you like.
Zucchini is by nature bland, so choose a sharp flavored cheese for the topping. Mozzarella is nice and melty, but it doesn't have enough personality for this dish.
You could prep this ahead of time and bake when ready.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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