In a bowl, mix together the oats, milk, half-and-half, raisins, brown sugar, vanilla, salt and apple. Cover and refrigerate overnight.
Preheat the broiler.
Give the mixture a stir and add a bit more milk or half-and-half if it has become too thick. Put a healthy portion in an ovenproof bowl and smooth out the top. Sprinkle with an even layer of granulated sugar. Place under the broiler until the sugar melts and just starts to brown (or you can brown it lightly with a kitchen blowtorch). Serve with blueberries, raspberries, strawberries and a little more half-and-half, if desired.