Preheat oven to 425°F. Rub poblano pepper with vegetable oil. When the oven is hot, roast the pepper for 6 to 8 minutes on each side. Remove pepper from the oven. Allow it to cool slightly, then remove the tough outer skin. Finely chop the poblano pepper. Place 1/4 cup of the chopped pepper in a medium bowl.
Chop jalapeno very finely. If you do not like heat, remove seeds before chopping. You may also want to start with 1 teaspoon of jalapeno before adding the second teaspoon. Add the chopped jalapeno to the bowl.
Add chopped cilantro, red onions, and salt. Stir in the lemon and lime juice. Stir well to mix the salsa together.
Refrigerate for a couple of hours before serving. This will allow the flavors to marry together.