Heat a large frying pan to medium high heat, then add olive oil. When oil is hot, add the chicken thighs and cook, turning, about 12 minutes, or until chicken is golden brown on all sides and fork can be easily inserted. Remove chicken from pan and drain off any excess oil. Place onion in pan and saute over medium heat for 2 minutes; add garlic and saute for an additional minute. Slowly add chicken stock, scraping pan to dissolve bits clinging to the bottom. When chicken stock begins to bubble, add ginger, allspice, cloves, salt, black pepper, chipotle chili, lemon juice, mustard, apricots, raisins, and cranberries. Allow to simmer for 10 minutes, then add chicken; continue to simmer until chicken is cooked and the liquid reduced to a light syrup, about 15 minutes. Add the liqueur to the frying pan and bring the mixture to a boil. Remove from heat and add chopped walnuts. Serve over rice.