Baked Tilapia Sandwiches

By csoltow

5.0 / 5

10min

15min

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4 (4 ounce) tilapia fillets
2 tablespoons olive oil divided, or as needed
½ teaspoon Cajun seasoning or to taste
1 pinch salt and ground black pepper to taste
2 medium onions thinly sliced
1 (14.5 ounce) can diced tomatoes drained
2 tablespoons capers
4 submarine sandwich rolls split