Bratwurst:

Please don't overcook! That's the most common mistake in preparing brats. And don't pierce brats with a fork or knife, or the essential juices will run away.

On the grill:
Frozen brats can be placed on a preheated grill with the heat reduced to medium. Turn frequently. Cook for approximately 45 minutes, or until done.

Or parboil:
Place brats in a pan of cold water; bring to a boil, then simmer 20 minutes. Instead of water, brats can be parboiled in beer, or a combination of beer, water and onions. Take parboiled brats and place on grill set at medium for 15 – 20 minutes or until browned with an internal temperature of 166 – 160 degrees fahrenheit.

If parboiled brats are not going on the grill right away, refrigerate them.

Or, in a frying pan:
Fry brats in beer with chopped onions for 20 minutes at medium heat.

Sausages:

To simmer:
Thaw sausage ring. Put 2" of water in a pan and bring to a boil. Place ring in pan and reduce heat to simmer for approximately 45 minutes or until done.

To bake:
Ring can be baked in oven at medium heat.