Cook the bacon in a medium skillet over medium heat, stirring occasionally, until crisp, 9 to 11 minutes. Remove to paper towels; reserve the drippings in the skillet.
Whisk the vinegar, sugar, mustard and 1/4 teaspoon each salt and pepper into the drippings. Slowly whisk in the olive oil until emulsified.
Place the spinach in a large bowl and pour the warm dressing on top; add the grapes, blue cheese and the reserved bacon and toss. Season with salt and pepper. Top with croutons.
Tools You May Need
Photograph by Johnny Miller
Courtesy of Food Network Magazine
Tools You May Need
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