cut the tenderloin into1 1/2 inch slices. Place the sliced tenderloin into a bowl and toss with the olive oil. - Heat a Large pan over Medium High Heat, add the pork from bowl and brown, about 2 or 3 minutes per side. It does not need to be fully cooked through, in the same pan with pork add in theonion and leaks and continue to cook untill the onion and leak are tender and begin to brown, about 5 or 6 minutes., Then add the caraway, fennel and celery seeds, mustard, blk. pepper, orange zest and juice and the chicken broth. Bring to a boil, Cover and reduce heat to a simmer. cook untill the Pork is very tender, about 15 to 20 minutes.
When the Pork is tender, use a slotted spoon and remove it from the pan, place pork on a cutting surface, using 2 forks shred the meatto bite size chunks, then return the meat to the pan, add in the sweet potatoes,cabbage and celery, continue to simmer untill the vegetables are tender, then season with salt to your taste.
In a small bowl, stir togeather the yogurt, ketchup, and the relish. place a dollop of the mixture on top of the stew in the serving bowls. And if you like a sprinkl of fresh dill.