For best results, place the sealed package in the refrigerator to thaw about half a day before your meal - overnight if you want it for lunch, in the morning if it’s for dinner. If your plans change, the chilled and still sealed package will last up to 3 days in the refrigerator. If you’re in a hurry, just put the package for 20 minutes in a bowl with lukewarm water to thaw.
Heat the burgers in a skillet (low heat, with lid, turning 2-3 times, about 6 minutes) or in a dish in the microwave (800W, about 5 minutes). Either heat the potato salad next to it or eat it cold, if necessary loosening it up with a little water.
Curd or yogurt with herbs or spices (dressed with mint, parsley, garlic and olive oil and harissa or curry if you like) adds some freshness to this dish and is perfect as a sauce for the burgers. A fruity chutney also goes well with it.