Add in the vanilla, rum and almond extract, and salt, and blend till smooth.
Evenly divide and spread the marmalade between the four slices of bread.
Spoon out the frangipane and spread it to the edges of each bread slice. You may only need 3 tablespoons per bread slice, depending on how large the bread you are using is. If not, feel free to use up to a 1/4 cup. The layer should not be too thin, nor should it be too thick. If it is, as it bakes it will run off the bread unnecessarily.
Any remaining frangipane can be stored in the freezer.
To reheat any leftover Bostock, use a toaster oven (or even the air fryer at a low temp) till warmed through. Do not use the micowave.