3 bread lemon bars Recipes

any kind of wholemeal bread (i like seeded batch with plenty of added whole-grains but use whatever you please), avocado, halved , stone removed, sized onion - finely diced, diced cucumber, minced garlic, any medium tasting cheese - typically cheddar - but any similar will do, a tsp of cayenne pepper, a pinch of salt, a few drops of lemon or lime juice

butter, cold unsalted , plus, butter, cold unsalted cut into 1-inch pieces, plus more for pan, unbleached all-purpose flour, sugar, cornstarch, coarse salt, granulated sugar, eggs, lightly beaten, unbleached all-purpose flour, fresh lemon juice , plus, fresh lemon juice , plus, fresh lemon juice, milk , plus, milk, coarse salt