Preheat oven to 350°F. Grease an 8x8 inch baking pan.
In a large bowl, whisk together the melted butter and sugar until combined.
Add the eggs one at a time, whisking after each addition.
Stir in the lemon juice and lemon zest.
Fold in the flour and salt until just combined, being careful not to overmix.
Pour the batter into the prepared baking pan and spread it out evenly.
Bake for 25-30 minutes, until the center is set.
Allow the brownies to cool completely before cutting into squares.
