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Prepare the Zucchini
Wash the zucchini and trim the ends. Cut them into 3-inch (7–8 cm) pieces. Using a zucchini corer or a small spoon, hollow out each piece, leaving about ¼ inch (½ cm) at the bottom. Sprinkle the insides lightly with salt and set aside while you make the filling. Save the scooped-out flesh for another use.
Make the Filling
In a large bowl, mix the ground beef, rinsed rice, grated onion, 2 tbsp tomato paste, dill, parsley, olive oil, salt, black pepper, red pepper flakes and dried mint (if using). Knead with your hands for 1–2 minutes until evenly combined.
Stuff the Zucchini
Fill each zucchini piece about three-quarters full, without pressing too hard. The rice will swell as it cooks.
Arrange in the Pot
Stand the stuffed zucchini upright, close together, in a wide pot or deep pan so they support each other.
Add the Sauce
Dissolve 1 tbsp tomato paste and the butter in the hot water, add ½ tsp salt, and pour carefully around the zucchini until the liquid reaches about two-thirds of their height. Place a small heatproof plate upside down on top to hold them in place.
Cook
Cover the pot, bring to a boil, then reduce the heat to low and simmer for 35–40 minutes, until the rice is tender and the zucchini is soft. Add a little hot water if the sauce reduces too much.
Rest and Serve
Let the zucchini rest, covered, for 10 minutes. Spoon some sauce over each piece, top with fresh dill, and serve warm with Greek yogurt (mixed with a little grated garlic if you like).