To make them, you only need ten minutes, a couple of bags of frozen pearl onions, red wine vinegar, and some sugar and spice (click the link below to see which ones Epicurious recommends). Boil the thawed onions for about four minutes and set aside. Toast the spices four a couple of minutes, add the vinegar and sugar (and any other extras like red pepper flakes or fresh thyme) and heat to dissolve. Pour on top of the onions and let cool to room temperature. Chill for at least 12 hours. Serve the onions at your fabulous holiday party as a cocktail garnish or as a cheese board accompaniment, or spoon into jars for a thoughtful and tasty gift.
Pickled Pearl Onions| Epicurious