Roughly chop the chard, omitting the stems if preferred. Add to a large mixing bowl with the vinaigrette and use your hands to massage well. The greens will be wilted down to about half the size when they're ready.
450 grams swiss chard, 100 ml honey mustard vinaigrette
Add the onion, fruit, and seeds to the bowl. Transfer to a serving bowl if desired and either serve immediately or let the salad rest, covered, for 30-60 minutes before serving.
1 small onion or shallot, 2 apples or other fruit*, 50 grams seeds or nuts
This salad stores well. Keep it for 3-4 days in the refrigerator, covered. Add the fruit later if using a soft fruit (if you know you'll be storing it, dried fruit is a good choice).
Notes
* If using dried fruit, a large handful of dried cranberries or raisins, about 60 grams or a third cup.