Preheat the oven to 375 F.

Peel the potatoes.

Cut each peeled potato in half lengthwise.

Place flat side down and cut down as if making very thin slices, but leave the bottom 1/2 inch intact.

Place potatoes in large roasting pan.

Melt the butter.

Coat potatoes with melted butter using a pastry brush.

Pour the olive oil around the potatoes and on the base.

Bake potatoes for 40-50 minutes, basting occasionally.

Meanwhile, juice the orange and zest half of it.

Place orange juice, rind, and sugar in a saucepan and heat on low.

Stir until sugar is dissolved.

Simmer for 3-4 minutes until thick.

Remove from heat.

When potatoes begin to brown, brush with orange glaze.

Return to the oven for 15 minutes or until potatoes are deep golden brown color.