In a large pot, bring 4 quarts water to a boil. Add the rice and cook, stirring occasionally, until the rice is still chewy in the center, about 12 minutes. Drain in a colander and transfer to a large bowl. Stir in the vinegar and salt and turn the rice out onto a rimmed baking sheet. Spread the rice into an even layer and set aside to cool. Once the rice is cool, transfer it to a large mixing bowl. Add the olive oil, mortadella, Swiss cheese, tuna, olives, capers, chile, garlic, parsley and lemon zest; season with black pepper. Taste and season with more salt if needed. Add the lemon juice and taste again, adjusting with more lemon juice, salt and/or pepper. Cover the bowl with plastic wrap and refrigerate for at least 30 minutes before serving.