1Broil onions and tomatoes cut side down for about 10 minutes until soft and slightly charred.
2Cook garlic cloves in oil over medium-low heat for about 10 minutes until browned and soft.
3Add chile árbol to the garlic and oil, cook until peppers start to darken and become fragrant, remove from oil. Add garlic and peppers to the blender.
4Turn off heat, add sesame seeds to oil and let it cool.
5Add lime juice, oil with sesame seeds, and dry seasonings to the blender with garlic and peppers. Blend until creamy and smooth.