- 2 tablespoons cider vinegar
- 2 tablespoons honey
- 2 tablespoons Dijon mustard
- 6 tablespoons olive oil
- 1/2 red onion, chopped (about 1/2 cup)
- 1/4 pound bacon, cut into 1/2-inch pieces (about 1/2 cup)
- 1/4 sesame seeds
- 1 large bunch spinach (about 1 1/4 pounds), coarse stems discarded and leaves washed well and spun dry
- 2 grapefruits, peel and pith cut away and sections cut free from membranes
- In a bowl whisk together vinegar, honey, and mustard and add oil in a stream, whisking until emulsified.
- In a large heavy skillet cook onion and bacon over moderate heat, stirring occasionally, until onion is pale golden and bacon is browned. Add sesame seeds and cook, stirring, until pale golden.
- In a large serving bowl toss together spinach, grapefruit sections, and bacon mixture. Add about half of dressing and toss to combine, adding more dressing if desired.