For homemade roasted jalapeños, place 2 fresh jalapeños on a burner of a gas stove over medium-high heat. Turn the jalapeños as they char until they're black all over. Place them in a paper bag and let them steam for 15 to 20 minutes. When the jalapeños are cool enough to handle, remove the charred skin and the seeds. Keep a bowl of water nearby to keep your hands clean. Chop and set aside.