Turn the pot to the high saute setting and when hot, add the oil. Stir in the curry powder, cumin and turmeric and cook until the spices are fragrant, about 30 seconds. Stir in the onions to coat in the oil and spices. Cook, Stirring frequently, until the onions are softened and slightly browned, 7 to 8 minutes. Add the ginger and garlic and stir to coat. Cook until the garlic starts to soften, 1 to 2 minutes more. Add the tomatoes and cook until they break down and lose their structure, 6 to 7 minutes. Add 1 teaspoon salt. Cut the eggplant into chunks. Add the eggplant and peas to the pot and cook until completely warmed through, 2 to 3 minutes. Add additional salt to taste.