Wash the collard greens thoroughly and chop them into bite-sized pieces.
Dice the red onion, mince the garlic, and chop the tomatoes.
Heat the vegetable oil in a large pot over medium heat.
Add the diced onion and sauté until golden brown.
Stir in the minced garlic and berbere spice, cooking for an additional 2 minutes.
Add the chopped tomatoes, cumin, and salt, stirring until the tomatoes break down.
Incorporate the chopped collard greens, coating them in the flavorful mixture.
Pour in water as needed, cover, and let it simmer for 30 minutes, allowing the flavors to meld.
Taste and adjust seasoning if necessary.
Serve your Gomen Wat hot, perhaps with injera or rice.