Preheat the oven to 200°C (400°F), butter an ovenproof dish large enough to fit the pears in a single layer. Peel the pears and then cut each one in half and using a teaspoon scoop out the cores. Toss in the lemon juice to prevent them from going brown.
Place the butter in a bowl and beat in the pecan nuts then use the mixture to fill the cavities of the pear halves. Drizzle over the golden or maple syrup, or honey and bake for 25-30 minutes or until the pears are softened and the sauce at the bottom of the dish is bubbling.
To serve, arrange the baked pear halves on plates and spoon over any cooking sauces. Add a scoop of ice cream to each one.