Grilled Pork Tenderloin Sandwiches

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1/2 red onion, thinly sliced, separated into rings

1/2 cup mayonnaise

2 cloves garlic, finely grated

Juice of 1 lemon

Kosher salt

8 ounces shishito peppers

1 teaspoon extra-virgin olive oil, plus more for the grill

1 pork tenderloin (1 1/4 to 1 1/2 pounds)

Freshly ground pepper

1 tablespoon smoked Spanish paprika

1 teaspoon ground cumin

2 cups baby arugula

1 baguette, cut into 4 pieces and split