I'm probably too late but there is only ONE sauce for gammon, new pots and veggies ......and that's Parsley sauce.
I cooked a gammon for Boxing Day - so far as well as sandwiches most days we have had it with the aforesaid parsley Sauce (with mash and green beans and broccoli), with Jacket Spuds and salad, with sauteed spuds, fried eggs and peas, and in a pasta sauce with blue stilton. Still have enough for two more meals, I love it as after Christmas it's so good to have i nstant ingredients. Ooh, forgot thr Turkey & Ham Pie as well