The onions themselves are awesome in salads, on pizzas, in pasta salads, or on sandwiches. The "leftover" marinade makes the perfect base for a salad dressing. The tangy sweet combination is addictive.
For the onions: slice thinly and separate the rings.
Place in a small bowl or plastic container with a lid.
Pour the honey and vinegar on top and add the thyme. Shake.
Place in the refrigerator for up to 24 hours, shaking when you think about it. (To speed this process up, place in the microwave for 2 minutes. Onions will be ready in about 30 minutes but not as rich).
To serve, add to salads or sandwiches.
Take the last of your onions and the marinade and place into the blender.
Add olive oil and mustard. Blend until smooth. Taste. Add salt and pepper as you see fit.
You may feel the need to add a bit more honey (or just use honey mustard). Now you have sweet onion dressing.