This is a little time consuming soup but very well worth a try on weekends.
Braise/deglaze onions and garlic in a pot for 5-10 minutes.
Mix in the ginger, salt, and all spices and cook for a few minutes, stirring often.
Add tomatoes and sweet potato, stir. Add 1 1/2 cups of water, stir.
Bring soup to a boil, reduce heat, cover, and simmer for 5 minutes.
Add 2 cups of the peas and simmer, covered, for 10 minutes.
Remove from heat and add remaining 2 cups of water.
Puree in batches in a blender until smooth. Return to the pot, add the last cup of peas, and cook on medium heat for 3-5 minutes. Serve the hot delicious soup and enjoy.
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