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shortbread cookies
butter
lemon juice
eggs
cream of tartar
Mix in the melted butter and press the crumbs into the bottom and up the side of a 9 inch fluted tart pan with a removable bottom. Use the bottom of a glass or a tamp to firmly press the crumbs down.
Combine everything except the butter in a medium saucepan and whisk constantly over medium – med/low heat until thickened, about 10 mins.