Spray a medium sized crock pot with cooking oil
Salt and pepper your pork roast and place in the crock pot
In a medium saucepan warm 2 TBS olive oil
Saute your onions and garlic until golden and transparent in the oil
Add your salsa verde to the onions and garlic, stir
Add your oregano to this mix, stir
In a blender put your tomatillos with just barely enough water to cover them, blend to liquidity
Pour your onion, garlic, salsa verde mixture over your pork roast
Pour your blended tomatillos over your pork
Cook on high for 1 hour and then change to low for 6 hours
Shred your pork with a fork and let cook on low for another hour or ready to serve
Serve in soft tacos with all your favorite fixings, like grated cheese, sour cream, salsa, chopped tomatoes, cilantro