Creating Hawaiian Chicken Sandwiches is simple if you follow these steps:

1. Prepare the Marinade: In a medium bowl, mix pineapple juice, soy sauce, brown sugar, minced garlic, and ground ginger.
2. Marinate the Chicken: Place chicken breasts in a resealable plastic bag or shallow dish. Pour the marinade over the chicken. Seal or cover and refrigerate for at least 30 minutes, or up to 2 hours for deeper flavor.
3. Grill the Chicken: Preheat your grill to medium-high heat. Remove chicken from marinade and discard the marinade. Brush chicken breasts with olive oil and place them on the grill.
4. Cook Until Done: Grill chicken for 6-8 minutes per side, or until fully cooked and internal temperature reaches 165°F (75°C). Remove from grill and let rest for a few minutes.
5. Grill Pineapple: While the chicken rests, place pineapple slices on the grill. Allow them to grill for about 2-3 minutes on each side until caramelized.
6. Assemble the Sandwich: Slice the sandwich buns in half. Spread mayonnaise or avocado spread if desired. Layer the grilled chicken, grilled pineapple, and lettuce leaves on the bottom half of the bun.
7. Add Toppings: Optionally, add sliced red onions on top of the lettuce. Place the top half of the bun on each sandwich.
8. Serve Immediately: Enjoy your delicious Hawaiian Chicken Sandwiches while they’re warm!

These straightforward steps will guide you in preparing these incredible sandwiches with ease.