Create a poaching liquid for sweetbreads by combining all ingredients (except sweetbreads and oil) in a pot and bringing it to a boil. Boil for 10 minutes, then place sweetbreads into liquid. Gently cook sweetbreads for about 25 minutes. Remove pot from heat and dump sweetbreads and liquid into a bowl placed in an ice water bath. Once liquid has cooled, remove sweetbreads from liquid. Peel and clean them. Finish sweetbreads by cooking on a wood grill with oil and salt and pepper to taste. Reserve until needed.