Just love sticky recipes and especially plum ones, this one is from Recipe+, I would personally add a finely diced small red chilli to give a little zing and would add into the plum marinade and mirin. This is a microwave recipe and may vary depending on the wattage of your microwave unfortunately they don't state a wattage. They also suggest you could double the meatball mix and freeze for another day. No mirin use lemon juice. You could also use a mix of beef or lamb mince insteal of pork and beal but you will need to process 2 slices of day old white bread to make crumbs.