In a large, deep skillet, heat the olive oil. Add the lamb and cook over moderate heat, stirring often, until no pink remains, 3 minutes. Add the garlic and onion and cook, stirring occasionally, until the onion is softened, about 4 minutes. Add the tomatoes, diluted tomato paste and the red pepper paste and simmer for 1 minute. Add the zucchini and cook over moderately high heat, stirring, until just tender, about 5 minutes. Stir in the chickpeas and cook for 1 minute. Season with salt and pepper. Transfer the zucchini to a bowl and let cool slightly. Sprinkle with the parsley and mint and serve warm or at room temperature.