Prepare the pizza dough to your desired shape and preheat the oven to 500F.
To make the sauce, combine all ingredients in a food processor or blender and blend until smooth. Add water as needed to thin out slightly, and season with salt and pepper to taste. Set aside.
In a large frying pan over medium heat, add the oil, onion, and garlic. Cook for 1 minute, then add the ground cumin, garam masala, coriander, and turmeric. Cook for another two minutes before adding the potato and carrots.
Cook for 10-15 minutes, or until the potatoes and carrots are almost fork-tender. Add the chopped ginger and frozen peas, and cook for another three minutes. Season with salt and pepper.
To assemble the pizza, spread a generous layer of the sauce over your uncooked crust before evenly distributing the vegetable topping. Bake for 12 minutes, or until the crust is browning, in the oven.
Remove and serve immediately, lightly drizzled with plain yogurt diluted with water.
Recipe by The Kitchen Paper at http://c02.ddd.mwp.accessdomain.com/vegetarian-samosa-pizza/