Saute diced onion in olive oil over medium heat until transparent. Add garlic and saute until fragrant.

Add oregano, salt, pepper, and basil and stir until everything is absorbed into the oil.

Add vegetable broth and stir in diced tomatoes with juice and tomato paste.

Simmer until the tomato pieces start to fall apart. Blend with an immersion blender until smooth and velvety.

Stir in baking soda and let the foaming subside. If you find it still tastes too acid-y for you add some soy milk or coconut milk, and garnish with some chives. Basil works too, I just like chives.