In a large skillet, add two tablespoons vegetable oil, and heat to medium-high heat. Add diced onion, 1 whole Jalapeno and shredded pork. Season with salt, pepper and garlic powder to taste. Brown pork until you see the edges of meat get golden and slightly crisped. Add blended tomato, raisins and correct seasonings. If mixture seems too dry, add a bit of the reserved cooking liquid.