Heat oil in small skillet over medium-high and fry onions until golden.
While the onions are cooking, place tomatoes, garlic, basil, and pepper into blender and blend until liquified. * SIDE NOTE: I didn't have this many fresh tomatoes so I added 3 san marzano whole tomatoes (canned - no juice) to the fresh tomatoes.
When the onions are cooked, add them as well as the sun-dried tomatoes and tomato paste (I usually have a tube on hand in the fridge which is convenient when I need only a small amount at a time) to the tomatoes in the blender and blend until liquified.