Preheat oven to 325℉ and place oven rack to middle position. Line an 8x8-inch square pan with parchment paper.
In a large bowl, stir together the melted butter and sugar. Stir until sugar has dissolved. Add the eggs and stir until incorporated. Add the strawberry extract, vanilla, and lemon zest. Give a quick stir.
10 tbsp unsalted butter, 1¼ cup granulated sugar, 2 large eggs, 2 tsps strawberry extract, ½ tsp vanilla extract, 1 tsp lemon zest
Fold in the strawberry reduction until barely incorporated.
Add the all-purpose flour. Sprinkle the salt on top and fold until mostly incorporated (If you're not adding food coloring, mix fully now).
1 cup all-purpose flour, ½ tsp kosher salt
Add 2-4 drops of red food coloring to create a pink color worthy of the strawberry flavor, or dust with natural food coloring powder as a natural option (See note #2).
Pour the batter into the parchment lined pan and spread to an even layer.
Generously, sprinkle a thin, even layer of granulated sugar over top of the batter (optional).
Bake for about 30-35 minutes until the center is set, the blondies will bounce back when touched and will have a thin golden crust around the edges.
Let blondies cool completely before lifting from pan. Cut into 16 equal pieces, or whatever size you like.
Blondies may be stored in an airtight container and still taste great for up to 3 days after baking, if they last that long.