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Prosciutto TBM Sandwich

There is a chain of sandwich/coffee shops along the East Coast (and spreading!) that I absolutely love. Warm atmosphere, cool music, comfy chairs — I could hang out there for hours! The food and the coffee are awesome, too. My favorite dessert is the s'mores you make at your table! 

My favorite sandwich is their TBM -- tomato, basil and mozzarella served on flatbread with their house vinaigrette. The Mister teases me because I order the same sandwich whenever we go there, which isn't often. Most of the chain's locations are in the heart of the city, and we aren't down there a lot. 

So when I got a strong craving for the sandwich, I decided to make my own. The first hurdle was the bread. The website says their signature flatbread is an ancient Italian recipe (which of course, they aren't sharing). I decided to substitute ciabatta, an Italian bread that is relatively flat and rectangular. Another hurdle is their house vinaigrette, which again, they're not sharing. The rest of the sandwich was easy to put together. 

All in all, it was a pretty good adaptation. I made way too much vinaigrette, so I tossed the remainder with raw spinach leaves, grape tomatoes and feta for a side salad. Cosi offers a TBM with chicken, but I made my adaptation with prosciutto. The "real" TBM is not warmed, but a TBM "melt" is available at Cosi. 

Prosciutto T.B.M. Sandwich
Inspired by the TBM at Cosi
Yield: 2 large sandwiches or 4 mini sandwiches


  • 2 tablespoon extra-virgin olive oil
  • 1 ½ tablespoon red wine vinegar
  • Salt and pepper to taste
  • 1 loaf ciabatta bread (or other flatbread)
  • 3 vine-ripened tomatoes, sliced about ¼-inch thick
  • 1 pound mozzarella, sliced ½-inch thick
  • 3 ounces prosciutto*


  1. Whisk together the olive oil and red wine vinegar. Season to taste with salt and pepper. 
  2. Slice the loaf of ciabatta in half horizontally. Brush each half with the vinaigrette with a pastry brush. 
  3. Layer on the prosciutto, mozzarella, tomato and basil.
  4. Slice into halves or quarters. 
  5. If desired, place sandwiches on a baking sheet lined with parchment paper and bake in oven preheated to 350 degrees for about 20 minutes until mozzarella melts. Serve with side salad and/or potato chips. 
* Omit prosciutto for vegetarian sandwich. 

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