Combine the praline paste, gianduja, oil, salt, chocolate and corn syrup in a microwaveproof container and stir to combine. Microwave the mixture for 10 seconds, then stir it up and repeat four or five more times, until the mixture is fluid and homogeneous, with just the finest, tiniest amount of grit in it from the nut content. (Alternatively, you can do this in a heatp