Spicy Tuna Ceviche Recipe

Place chili garlic sauce, vinegar, calamansi juice, onion slices, and salt and ground black pepper in a jar, close, and then shake until well incorporated. Keep chilled until ready to serve. 

When ready to serve, remove tuna from refrigerator and slice tuna into bite-size pieces. Transfer to a bowl. Shake dressing to mix its contents and pour over the tuna. Quickly toss together to lightly coat the tuna, and transfer to a serving plate. Serve immediately.