PreparationMake vinaigrette: Mash garlic with salt to a paste. Whisk together garlic paste, mustard, honey, and vinegar, then add oil in a stream, whisking until emulsified. Make salad: Toast pine nuts in a dry large heavy skillet over moderate heat, stirring frequently, until beginning to turn golden, about 2 minutes. Add pancetta and cook until browned and crisp, about 2 minutes. Add cabbage, tossing to combine, and cook, covered, until wilted and just tender, 8 to 10 minutes. Reduce heat to low and add spinach, stirring gently until it just begins to wilt. Remove pan from heat. Add vinaigrette and toss. Serve immediately.