Add the garlic and ginger. Cook for 1 minute until fragrant.
Stir in the cumin, coriander, turmeric, cinnamon, cayenne pepper (if using), salt, and pepper. Cook for 30 seconds, stirring constantly.
Stir in the tomato paste.
Add the cubed sweet potatoes, diced tomatoes (with juice), rinsed chickpeas, and vegetable broth to the pot. Stir gently to combine everything.
Secure the lid on the Instant Pot and set the vent to Sealing.
Select Manual or Pressure Cook on High Pressure for 8 minutes.
When the cooking cycle finishes, allow a Natural Pressure Release (NPR) for 10 minutes, then carefully move the valve to Venting to release any remaining pressure (Quick Release).
Open the lid. Stir in the lemon juice. Taste and adjust salt and pepper if needed.
Serve hot, garnished with fresh cilantro.
Notes
Serve this stew over cooked couscous or brown rice for a complete meal.
For a richer flavor, add 1 teaspoon of harissa paste along with the spices in step 3.
If you prefer softer sweet potatoes, increase the pressure cook time to 10 minutes.