Place grape seed oil in small hot stock pot, add onions, tomatoes and garlic. Saute until fragrant, lower heat and cook until translucent and tomatoes are breaking down. Add spices, sugar, butter and saute.
Transfer ingredients into a blender and puree. Return to the pot.
Place all ingredients in a medium saucepan, cover with just enough water, cover and let simmer for about 2.5 hours.
Remove pork and return liquid back to stove top. Bring to a boil and let reduce by 3/4.
Add shredded pork back in to the liquid and simmer for 15 more minutes and add Stubb's Original Legendary Bar-B-Q Sauce. Finish with salt to taste.
