Because surely you have some sauerkraut juice in the fridge?

I’m guessing “liquefy until glossy” means emulsify. I’ve heard of German recipes using sauerkraut juice in dressing.

From a box sold in Chicago, Illinois.

Sweet-Sour Dressing 2 oz. sauerkraut juice

1 medium lemon (including skin)

1/2 tsp. salt

3-1/2 Tbsp. honey

1 cup oil Liquefy all ingredients together except oil, then add oil slowly and liquefy until glossy. Mildred Vest