01 -
Heat oven to 350°F. Create parchment paper sling in 8x8 inch pan using two overlapping pieces.
02 -
Beat butter and sugar until light and fluffy, about 3 minutes. Mix in flour and salt. Press evenly into pan.
03 -
Bake until lightly browned, 15-18 minutes. Remove and set aside.
04 -
Whisk eggs and sugar for 1 minute until slightly thick. Add flour, grapefruit juice and zest. Pour over warm crust.
05 -
Bake until lightly browned and set, 18-20 minutes. Cool completely, then cut into 16 squares.