Place the cleaned strawberries, water, sweetener, and lemon juice into a high-speed blender.

Process on high speed for approximately 60 seconds until the mixture is completely liquefied.

Position a fine-mesh sieve over a pitcher and pour the mixture through to remove seeds and pulp.

Press the solids with a spoon to extract all remaining juice.

Discard the solids and stir the liquid well.

Pour into glasses over ice and serve immediately.