Heat the butter in the cooker. Saute the onions and caraway seeds until the on ions are soft,about 3 minutes. Add the remaining ingredients and stir to combi ne. Lock the lid in place and over high heat bring to high pressure. Adjust h eat to maintain high pressure and cook for 5 minutes. Reduce pressure with the quick release method. Remove the lid, tilting it away from you to allow any e xcess steam to escape. Discard the bay leaves. Adjust seasonings and serve.