Cut the zucchini in half horizontally (You can also cut the top off traditionally, keeping the zucchini whole. See our article on How to Stuff Round Zucchini). Hollow them out, leaving about 1 cm of flesh around the edge. Chop the scooped-out flesh to use in the filling.
Dice the smoked tofu, coat the cubes in rice flour, and fry them in a little oil until they are crispy. Set aside.
Peel and chop the onion, then sauté it in a bit of oil. Add the tomato purée, and season with salt and pepper.
Add the chopped zucchini flesh. Cook until the water from the zucchinis has evaporated.
Remove from heat and add the smoked tofu cubes (reserve a few for garnish).
Stuff the zucchinis with this mixture.
Place the stuffed zucchinis in an oven dish, sprinkle with grated cheese (or breadcrumbs). Add one or two tofu cubes on top for decoration.
Bake for 30 minutes at 200°C.