On the day prior, slice the heart and lung into pieces approximately a quarter of an inch thin and remove any excess gristle. Then cut each piece into fine, thin strips. Combine pressed juniper berries, cloves, pressed allspice kernels, and laurel berries into a reusable mesh tea-ball for steeping. Bring the red wine vinegar, beef broth, and tea-ball to a boil together in a stock pot. Once to a boil, add the heart and lung pieces, mix well, cool, and allow to marinate overnight.