Add strawberries and lemon juice to a cocktail shaker. Muddle together until the strawberries are crushed and release their juices.
Add in simple syrup and stir together.
Fill a wine or spritz glass with small cubes of ice. Strain or pour the entire fruit mixture over the ice. Top with sparkling lemon soda and gently stir together once more.
Garnish with a lemon wheel.
Notes
Note on straining: I prefer to not strain the cocktail because I love the bits of fruit in the drink (gives it a sangria feel) but you can strain it if you want a smoother texture.