To start making French Onion Tart Recipe, make pastry dough first. Add flour, salt, sugar and butter cubes into a large bowl. Utilizing your fingertips break all of the butter cubes and rub it with flour. Add chilled water little at a time and knead to make a easy dough.
Roll the dough and canopy it with cling wrap and place it in fridge for about 1 hour.
To make caramelized onions, warmth butter in a large pan. Add skinny sliced onions into the pan and sweat the onions. Add salt and sugar, cook dinner till onions are good softened and browned evenly.
Add balsamic vinegar, lime juice and thyme; enhance warmth to excessive; boil for 2–3 minutes to cut back, stirring often.
Take off the warmth and put aside to chill.
To organize the tart preheat the oven to 200 levels centigrade and line a tart sheet pan with parchment paper.
Take away pastry from fridge and permit it to come back to room temperature for 10 minutes. Divide the dough into equal parts and roll the dough to about 2-3 mm thick.
Place the dough on the ready sheet pan and trim the sides. Refrigerate once more for 10 minutes.
Fill a parchment sheet with raw beans (That is solely to keep away from the tart to puff up and later the raw beans are eliminated and will not be the a part of the recipe). Place it over the tart dough that will probably be baked.
Pop this into an personal and bake for about 10 minutes or till you see brown spots on the tart.
Take away the raw beans parchment filling, and fill it with caramelized onions, sprinkle some extra salt and pepper powder excessive and sprinkle some thyme leaves.
Bake in oven for about quarter-hour.
Serve French Onion Tart Recipe together with tomato ketchup.