Clodagh McKenna's Apple-Cinnamon Porridge with Rhubarb Jam

In medium saucepan over medium heat, bring oats, milk, and salt to a boil. Reduce heat to a simmer. Cook, stirring occasionally, until oats are almost tender, about 5 minutes. Stir in cinnamon. Continue to cook until porridge is tender, about 5 minutes; add apple during last 2 minutes of cooking. Stir in more water or milk if you want thinner porridge. Serve in warmed bowls with toppings.