Drain beans. Divide into bundles of approximately 5 beans each. Cut one slice of bacon in half, wrap around beans and secure with a toothpick. Broil on a rack until the bacon is cooked.

To make the sauce: combine butter, vinegar, salt, paprika, parsley and onion juice, simmer until hot. Pour over the cooked bean bundles and serve. Beans and sauce may be done ahead of time and refrigerated. Broil bean bundles and reheat sauce at serving time.