Cook bacon in large skillet over medium-high heat for 10 minutes, or until crispy. Drain bacon slices on paper towel. Crumble 7 slices of bacon and mix into broccoli mixture. Crumble remaining bacon and mix into dressing.

Combine broccoli, red onion, grapes and celery in large bowl.

In a separate bowl, whisk together mayonnaise, sugar and apple cider vinegar.

Pour dressing over broccoli and toss together.

Mix in slivered almonds so everything is thoroughly coated, then cover bowl with plastic wrap, and refrigerate for at least 2 hours before serving so flavors combine.