Warm the sauerkraut in a small sauce pan.

Saute the onion in olive oil until caramelized. Add garlic to pan. then ad a small amount of stock and simmer for a couple of minutes.

Slice the sausage and sauté to heat.

For each serving, top mashed potatoes with the sauerkraut, the onion-garlic mixture, and the sausage.

Sprinkle with green onion.