Goat Cheese and Red Onion Frittata Sandwich Crunchified with Pepper Relish

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Eight 1/4-inch slices pancetta

Kosher salt and freshly ground black pepper 

2 tablespoons olive oil 

1 medium red onion, halved and thinly sliced 

1 clove garlic, finely chopped 

8 large eggs 

4 ounces goat cheese, cut into small pieces 

2 tablespoons chopped fresh herbs, such as parsley or basil 

2 tablespoons hot pepper relish, such as B&G 

4 ciabatta rolls, halved horizontally and lightly toasted 

4 ounces baby arugula or watercress