In 3-quart casserole snip bacon into 1 inch pieces
Cover with paper towel
Microwave at High 10 2 to 3 minutes until crisp
With slotted spoon place bacon on paper towels to drain To bacon drippings add vinegar sugar salt pepper and tarragon Microwave at High 10 2 to 3 minutes until mixture boils
Stir in celery and onion
Gradually add spinach to hot dressing tossing to coat each piece