Moroccan Stuffed Tomatoes

3 tablespoons extra-virgin olive oil, plus additional for brushing baking dish
6 medium ripe tomatoes, tops sliced off and seeds removed
1 medium onion,thinly sliced
2 garlic cloves, minced
450g zucchini, trimmed and grated
3 tablespoons finely chopped cilantro (coriander)
1/3 teaspoon chili flakes, or to taste
3 tablespoons roasted shelled pistachios.

1. Heat the oven to 350 degrees. Brush a baking dish, large enough to hold the tomatoes snugly, with a little olive oil. Arrange the tomatoes in the dish, cut side up, and sprinkle lightly with salt.

2. Place a large frying pan over medium-high heat, and add 3 tablespoons olive oil. Heat until shimmering. Add onion and sauté until golden and translucent, about 5 minutes. Add garlic and zucchini, and sauté until the zucchini is just starting to soften, about 2 minutes.

3. Remove pan from the heat, and add cilantro, chile flakes, and 2 tablespoons pistachios, mixing well. Divide the filling equally among the tomatoes, mounding the tops.

4. Bake for 45 minutes, or until the vegetables are cooked as desired. Garnish with the remaining pistachios. Serve warm or at room temperature.