Arrange the sausages in a baking dish or pan.

In a medium bowl, add beer, onion, cilantro and salt and pepper. Mix.

Pour mixture over the sausages.

Cover and place in the refrigerator overnight to marinate.

Place a large Dutch oven or heavy pot over medium-high heat.

Add olive oil and marinated sausages.

Cook until browned on all sides, about 8 minutes.

Pour in marinating mixture.

Bring mixture to a boil (increase heat, if necessary), then reduce heat and continue to cook, at a low simmer, until onions are soft and translucent, about 7 - 10 minutes. Add water or more beer if mixture starts to get too dry.

Check to make sure sausages are done and internal temperature has reached at least 165°F.

Arrange sausages on a serving place.

Pour cooking liquid over sausages.

Serve with crunchy bread and Gordon Czech Style Pilsner Mustard (See below for a Link to the Recipe).