Toast the 3 slices of wholegrain bread until lightly golden and place them on a clean work surface, toasted side up.
Spread the 3 tablespoons smooth peanut butter evenly over one side of each toasted slice.
Spread the 1 tablespoon strawberry jam over the peanut-buttered side of one slice.
Arrange the 1.5 oz (40 g) sliced strawberries in a single layer on the peanut-buttered side of a different slice.
Assemble the sandwich: place the strawberry-topped slice on the work surface with the strawberries facing up, set the jam-topped slice on top of it with the jam side facing down so the jam contacts the strawberries, then place the remaining peanut-buttered slice on top with its peanut-butter side facing down. Press gently to compact.
Cut the sandwich into halves or quarters and serve immediately, or wrap to take with you.