At one of my recent cookery demonstrations I got a great tip to make an all-in-one white sauce, which simplifies the process here. There are two things that are key to this method: the milk must be cold when you start, and remember to keep whisking vigorously until the sauce thickens. If you want to take this simple recipe one step further, add some fried smoked streaky bacon bits. This is a great dish for a leftovers lunchbox the next day.
These marinades are super with any meat. I sometimes mix the marinades in a resealable plastic bag, then drop in the meat, seal up the bag, give it all a good squish and pop in the fridge or freezer until I'm ready to use it. Most meat will be good in the fridge for three days or in the freezer for up to three months, still sitting in the marinade.