Preparation 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.
Preparation 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.