Soak the cashews for 8 to 12 hours. Drain and rinse.: The texture after soaking should feel tender and slightly spongy when you press a cashew between your fingers, not rock hard. This long soak hydrates the kernels so they will blend into an ultra creamy base without grit. I usually soak them overnight in cold water, and in the morning they smell faintly nutty and are easy to mash with a fork. A common mistake is under soaking which leads to a grainy filling, so if you are short on time, cut the cashews into smaller pieces and add a bit more blending time, but still expect a less silky end result.
Add cashews to a high-powered blender along with the remaining cheesecake filling ingredients. Blend until completely smooth. It will take several cycles of blending (about 2 full minutes of blend time) to get the mixture smooth. If necessary, add more almond milk or water to get the ingredients to blend.: As the blender runs you will notice the mixture first break down into a thick, coarse paste, then slowly turn glossy and smooth, with air bubbles forming on the surface. Stop and scrape the sides every 20 to 30 seconds so everything reincorporates, and listen for a steady, higher pitched motor hum which signals the mix is loosening. The smell evolves from raw nuts to sweet and citrusy as the maple syrup and lemon wake up. If you add too much liquid at once the filling can become runny and will not set well, so add almond milk one tablespoon at a time, testing the texture as you go.
Transfer “cheesecake” filling to a container and refrigerate until completely chilled, about 2 hours.: Chilling firms the filling so it will hold shape when scooped into the strawberries , and the cold also helps flavors marry. After refrigeration the filling should be cool to the touch, slightly denser, and hold gentle peaks if stirred. If you taste it and it seems muted, a tiny flourish of lemon juice can brighten it. Avoid freezing, which can alter texture and make the filling grainy.
Rinse the strawberries well and pat dry with a paper towel. Chop the tips and tails off and use a pairing knife or melon baller to scoop the insides (hull) out of each strawberry.: The clean, dry surface of the strawberries helps the filling adhere, and hollowing them carefully prevents tearing the flesh. You want a little rim at the top to contain the filling, so stop scooping if the berry feels thin. The scent of the berries will be fresh and fruity while you work. A common error is overhollowing which causes the berry to collapse, so keep the walls about the thickness of a dime where possible.
Stuff each strawberry with the vegan “cheesecake” filling and top with fresh blueberries and/or coconut sugar. You can also drizzle each strawberry with melted white or dark chocolate.: As you fill, you should feel slight resistance as the chilled filling slides into the berry, and the surface will look glossy and smooth when leveled. Press a single blueberry on top for color contrast, or sprinkle a touch of coconut sugar for a tiny crunchy finish. If you choose to drizzle chocolate, do it sparingly and let it set briefly in the fridge so it forms a delicate shell. Beware of overfilling, which makes the bites awkward to eat and can cause the filling to spill.
Serve chilled and enjoy!: These taste best straight from the fridge when the filling is firm yet creamy, and the strawberries remain cool and bright. Arrange them on a plate and keep any extras chilled until serving to maintain texture. If left at room temperature too long the filling softens and the berries can weep, so plan to serve within 20 to 30 minutes after plating for optimal presentation.