For the cauliflower zucchini curry, first heat oil in a non-stick saucepan. Sauté onion in it over mild heat until soft and translucent. Add curry powder, stir-fry briefly.
Stir in cauliflower and garlic, salt lightly, stir-fry briefly. Pour in vegetable soup, season with ginger and lemon zest. Cover curry and simmer about 8 minutes until cauliflower is almost tender. Stir occasionally during this process.
Stir in zucchini and peas, cover and simmer about 3 minutes. Stir in soy cream. Simmer cauliflower zucchini curry briefly more, season with salt and lemon juice.