Chimichurri Grilled Steak

Ingredients:

For the steak:
– 2 lbs steak (sirloin, ribeye, or flank)
– 1 tablespoon olive oil
– Salt and pepper to taste

For the chimichurri sauce:
– 1 cup fresh parsley, finely chopped
– 1/4 cup fresh cilantro, finely chopped (optional)
– 4 cloves garlic, minced
– 1 small red chili, finely chopped (optional, for heat)
– 1/4 cup red wine vinegar
– 1/2 cup olive oil
– 1 teaspoon dried oregano
– 1/2 teaspoon red pepper flakes
– Salt and black pepper to taste