In a blender, combine the tomatoes and curry powder.
Blend into a smooth paste.
Add red lentils, barley, chopped vegetables, onion powder, and salt to the Instant Pot.
Pour in the blended tomato paste, followed by 4 cups of water and chopped cilantro. Mix well.
Seal the Instant Pot and cook on high pressure for 20 minutes. Allow the pressure to release naturally.
Once done, mix and mash the vegetables slightly, then simmer for 10 minutes. Your soup is ready to serve!
Notes
Adjust the salt and spices to your preference.
Making a tomato paste is optional—you can chop the tomatoes finely and add them directly to the soup.
Fire-roasted canned tomatoes are also a great alternative.
Slow cooker method: Prepare the tomato paste as described above, then add all ingredients (including water) to the slow cooker. Set to low and cook for 7 hours. Your soup is ready! Stovetop pressure cooker method: If using a stovetop pressure cooker, start by sautéing the vegetables with one teaspoon of oil. Then, add soaked lentils, barley, 4 cups of water, salt, and the blended tomato paste. Pressure cook for 3–4 whistles, and it's done!