this is the latest of my experimentation with infusions: onion-infused vinegar. the red onion gives the vinegar a beautiful pinkish watermelon-ish tint and a nice wallop of onion flavor, minus the bite. and so easy! just dice up some red onion (i whole red onion for one small jar of white vinegar), bring the vinegar to a simmer in a saucepan, add diced onion and pour the contents of the saucepan plus a pinch of salt into a large jar and let sit for a week or two. strain out the onion and store in a tightly sealed jar.