Peel the onions, chop them finely, and put them in a large saucepan with olive oil, garlic cloves, and the bouquet garni. Add salt and pepper, and cover. Let it cook on low heat for 45 minutes.
Remove garlic at the end of cooking.
To make the Tart shell:
Put 125 g of flour on a work surface or in a bowl, make a hole and add the yeast diluted in a little warm water.
Mix the ingredients to obtain a dough ball and let it rest, covered with a cloth. The dough should double in volume within 30 minutes.
Place the remaining flour in a bowl and add water, olive oil, and salt in the middle. Work the dough, adding water until you reach the desired consistency. Add the yeast to the dough and knead it together. Cover and let it rest for an hour.
Cooking:
Preheat the oven to 350°F (180°C).
Oil a pie pan or a baking sheet, spread the dough to a 1/2 cm thickness, add the onions, and decorate with anchovies and olives.
Cook for 18 – 20 minutes.
Season with pepper when removing from the oven, and serve with a side of salad or as an appetizer.
Notes
**If you do not wish to make your own dough, a pre-made tart or pizza dough will work just as well