Stuffed Zucchinis (Kabak Dolması)

4 zucchinis * 1 tbsp tomato paste * 2 cups hot water

For the filling:

1 cup bulgur * 1 big onion * 1 cup water * 1 tbsp all spice * 100 g parsley * 1 tbsp olive oil * salt

For the yogurt sauce (sarımsaklı yoğurt):

5 tbsp yogurt * 2 minced garlic cloves * 2 tbsp thyme * salt

Cut a little of the base of each zucchini so they can remain upright. Cut also a little of the top of each one. Cut them in half. Remove the pulp of the zucchinis with a coffee spoon. Reserve. Mince the onion and sauté in the olive oil. Add the bulgur and the minced parsley and sauté a little more. Season with salt and all spice. Add a glass of water and cook over low fire until the water evaporates. Stuff the zucchinis with this mixture and place them in a pot with two cups of hot water and a soup spoon of tomato paste. Close the pot and cook on low fire for about 45 minutes. Mix all the ingredients of the yogurt sauce. Serve the zucchinis with the yogurt sauce.