Everything you get in a supermarket has been chemically treated. It's best to make your own. Just buy a slab of słonina (pork fatback), dice it and render it, ie melt it down in a pan over flame. Stir until nugets are golden brown, then remove from flame, add 1-2 finely minced onions, a peeled finely diced apple and several buds minced or crushed garlic. Salt & pepper to taste and (optional) add a teaspoon or 2 rubbed marjoram. Stir and return to low heat until onions is just golden. Be sure the garlic doesn't burn because it'll impart a bitter taste to your spread. When cooled to room temp transfer to jar with twist-off lid and refrigerate until needed. Great on rye bread with an ice-cold nip of Wyborowa or Soplica to help digest it. A brined cucumber (ogórek kwaszony) is also nice on the side. Smacznego! - Bon appétit!