This recipe was the fortuitous result of my attempts to duplicate a chutney that is served at a local Indian restaurant.
1 tennis-ball sized yellow onion, minced
1/2 tsp cayenne pepper (or to taste)
1/2 tsp turmeric
2 tsp sugar
2 TB cider or other vinegar
large pinch salt
If onion is very strong, soak it in 1 quart hot tap water for 10 minutes, then drain. Put vinegar and sugar in a small bowl and heat in microwave. Stir until sugar dissolves. Mix with onion and other ingredients. Let sit for at least an hour, stirring now and then.