Kosher. Natural Source Omega-3. Wild Caught. Skinless & Boneless. In Olive Oil. Quality Product Since 1948. . Crown Prince Skinless and Boneless Sardines are prepared from only the highest quality Pilchard sardines available. These kosher sardines are packed in pure olive oil and are considered among the finest tasting sardines in the world. These popular sardines are firm in texture and delicate in flavor. Just one can provides almost half of the needed daily protein. Try them in salads, sandwiches, casseroles or straight out of the can.