If you cannot find Shiro powder at a nearby grocery store, begin by preparing your Shiro powder. Simply combine all ingredients and set aside.
Heat a large skillet and dry roast chickpea flour, berbere, cumin, garlic powder, and salt for 2 minutes.
To prepare the wat: Heat ½ cup of oil in a large pan and cook diced onions. Let cook for 1-2 minutes, just until aromatic and slightly translucent.
Once aromatic, add your tomato paste and minced garlic and quickly sautee, only about 30 seconds.
Now add your Shiro powder little by little, making sure to stir briskly with a spoon. Make sure that the powder is mixed in well before adding your 2 cups of water.
Bring the mixture to a medium bubble, until small bubbles begin to form, and then reduce heat to medium-low.
Let the mixture simmer for 10-20 minutes, depending on your desired consistency. Stir every few minutes.
Once it has reached your desired consistency or the oil has begun to rise to the top, it is ready to serve. Serve alongside a salad or vegetables and injera or rice!