Make the simple syrup by combining 1 cup sugar and 1 cup water in a small saucepan. Bring to a boil, stirring until the sugar completely dissolves. Remove from the heat and let cool for about 30 minutes.

While the syrup cools, blend the strawberries with a small amount of water until smooth. Strain through a fine-mesh sieve if you prefer a smoother texture.

Juice the lemons until you have 1 cup of lemon juice. Strain to remove seeds and excess pulp if desired.

In a large pitcher, combine the cooled syrup, lemon juice, strawberry purée, and 4 cups cold water. Stir until well mixed.

Taste and adjust as needed. Add more lemon juice if it’s too sweet, or more water or sugar if it’s too tart.

Serve over ice in a pitcher or individual glasses. Garnish with lemon slices, whole strawberries, and mint leaves if using.