You will need a wide pan that will hold the peach halves in one layer.
Pour the water, sugar, and the vanilla extract or vanilla pod which should be split lengthways into the pan and brings to a boil to dissolve the sugar.
Cut the peaches in half, twisting them to separate the halves.
Remove the peach stones with a small spoon or knife and place them in the pan, cut side down (the water should just cover them).
Reduce the heat and simmer for about 10 minutes or until they are tender.
Remove the pan from the heat and allow the peaches to cool in the syrup.
When cool, take the peaches and remove the skins then place them on kitchen paper to absorb the liquid.
Chill the peaches in the refrigerator.
Raspberry Sauce
Put the raspberries, sugar, and lemon juice into a food processor and process for about one minute. If you don't have a processor, just squash them with a fork until mushy.
Press them through a sieve into a bowl to remove any seeds.
Add the liqueur if using and place in the refrigerator until you are ready to serve the dessert.
How To Serve
To serve your Peach Melba, place a peach halve on each dessert plate (cut side up) and place a scoop of vanilla ice-cream on each half.
Spoon the raspberry sauce over the top and garnish with some fresh mint leaves.