Heat butter in a sauce pan. Add the onion, season with 3/4 teaspoon salt and 1/4 teaspoon pepper and cook, covered, stirring occasionally until tender, 8 to 10 minutes.

Now add crushed garlic and cook for another 2-3 minute. Now add ginger and continue to simmer. Add the pureed tomatoes, peanut butter and sweet potatoes and salt.

Now add 2 bowls of water and bring this to a boil until the potatoes are tender enough. This should roughly take 15-20 minutes. Serve and garnish with peanuts if desired.

All the above-mentioned soups are easy to prepare. They roughly take about 20 minutes of cooking time. They are high on nutritive content and are tasty and will go down well with little ones.