In a medium saucepan tall enough to hold the pears upright, add sugar, water and orange juice. Turn the heat on medium-high, stir until the sugar is dissolved and bring the mixture to a boil.
Reduce to medium-low and let it simmer for 5 minutes.
Place the pears that have been cored in the simmering mixture, cover and poach them gently for 25 to 30 minutes or until just cooked through – to know when they’re done is by pricking with the tip of a paring knife.
Remove from the heat and let them cool off at room temperature in the syrup, uncovered.
When time to serve, drain pears and place them upright individually in serving plates or bowls. Drizzle on a generous amount of chocolate sauce over the poached pears, add a couple scoops of vanilla ice cream or crème Chantilly and serve immediately.