Italian Sausage and Pepper Burgers

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1 tablespoon olive oil

1 onion, thinly sliced 

1 red bell pepper, cored and thinly sliced 

1 tablespoon tomato paste 

12 ounces hot Italian sausage (if links, remove casings) 

12 ounces sweet Italian sausage (if links, remove casings) 

8 slices provolone 

1/4 cup mayonnaise

3 tablespoons pesto 

4 ciabatta rolls, buttered and lightly toasted 

Pickled banana peppers, for topping