Parboil the brats for 10 minutes, brown in the broiler, and serve the next day in a Nesco floating in beer and onions. PUrists will sneer at pre cooking but it's a necessity in this case. Works for us. Use Johnsonville if you can get them. They have a Stadium brat that is already pre cooked and very tasty.
Foods such as orange juice and milk are definitely enriched with vitamin D, but these foods are not intended to be good sources of Vitamin D, they are merely foods designed to prevent the most obvious vitamin deficiencies, particularly in children.
Common orange juice is made from the sweet orange. Different cultivars (for example, Valencia, Hamlin) have different properties, and a producer may mix cultivar juices to get the desired taste. Orange juice usually varies between shades of orange and yellow, although some ruby red or blood orange varieties are a reddish-orange or even pinkish. This is due to different pigmentation in ruby red oranges. The blood orange is a mutant of the sweet orange. Blood orange juice is popular in Italy and Hellas, but may be hard to find elsewhere.