"Turnips are hard" from Le Menagier:
TURNIPS are hard and difficult to cook until they have been in the cold and frost; you remove the head, the tail and other whiskers and roots, then they are peeled, then wash in two or three changes of hot water, very hot, then cook in hot meat stock, pork, beef or mutton.
Item, in Beausse, when they are cooked, they are sliced and fried in a pan, and powdered spices thrown on.
(from David Friedman)
and Shrimps:
Shrympes. Take Shrympes, and seth hem in water and a litull salt, and lete hem boile ones or a litull more. And serue hem forthe colde; And no maner sauce but vinegre.
(FROM Two 15th Century Cookery Books)
As you can see, 2 very simple recipes. The meal was rounded out with an apple, and orange, and a sour-dough roll I'd made earlier in the week.
As the shrimp were already pre-cooked, all I had to do there was let them defrost and then try them lightly salted and in several different vinegars. The two best vinegars were the cider vinegar I'd received from a friend and the fabulous, traditionally made, 18 year-old balsamic vinegar that I have. The salt and cider vinegar was probably closest to a period combination, but balsamic made right is also okay, it just isn't very likely on an English table unless it had been given as a gift. To the best of my knowledge, balsamic is mostly referred to in Italian records of the era. I confess I ate the shrimps with the balsamic vinegar, though, as it was brilliantly tasty.
The commercial vinegars I had were so strong that they really overpowered the shrimp. I'd probably water them down in future.
The turnips were also easy. As I am not fond of boiling things in multiple changes of water, and I did not want to deal with the bitter issue via salting the water (I inevitably oversalt), I cooked them in one wash of water and included one small potato. I don't know what magic that potato works, but it did draw out most of the bitter.
I then followed the instructions for frying them, and sprinkled them with a commercial blend of spices called "Chai." Cinnamon, sugar, ginger, cardemon--nice sub for powder douce. The turnips pretty much outshone the spice blend--I would have to use a much heavier hand with the spicing to have the spices really noticable. Salt helped, too. I enjoyed them and will likely make them again, working out the recipe a little more exactly. I liked it far better than I have ever liked armored turnips.