Wash and hull the strawberries, then slice them into 1/4' slices.
Optional: mix the lemon juice with 1 tbsp of water and dip the strawberry slices into the solution.
Lay the strawberry slices on a rack or on baking sheets lined with parchment or silicone mats. They can be touching but do not overlap the slices.
Dehydrate in the oven at 175°F for ~4 hours or until they are the desired consistency. I would recommend turning them over about halfway through, especially if you are drying on baking sheets.
Cool and then store in an air-free container at cool room temperature.