Preheat your oven to 175°C (350°F). Gather your equipment and prepare to assemble the sliders.
Slice the slider buns in half horizontally with a sharp knife, keeping the top and bottom connected if possible. Lay the bottom halves in your baking dish.
Layer slices of smoky ham evenly over the buns, covering the entire surface for that savory, juicy base.
Place fresh pineapple rings on top of the ham, spreading them out to add bright, caramelized sweetness.
In a small saucepan, whisk together mayonnaise, soy sauce, and pineapple juice. Warm gently over low heat until the mixture is smooth, slightly bubbly, and fragrant.
Using a basting brush, generously spread the tangy sauce over the pineapple and ham layers, ensuring even coverage and extra flavor infusion.
Place the top half of the buns over the layered fillings, pressing down gently to secure everything in place.
Melt the butter and brush it over the tops of the buns for a golden, glossy finish. If desired, sprinkle sesame seeds evenly over the tops.
Cover the baking dish with foil and bake in the preheated oven for 15 minutes, until the sliders are heated through and the sauce begins to bubble.
Remove the foil and continue baking for another 5 minutes, or until the tops are lightly browned and bubbly with caramelized edges.
Take the sliders out of the oven, let them sit for 5 minutes to settle, then slice into individual portions and serve warm. Optionally, add cheese slices on top before baking for a melted, cheesy finish.
