01 -
Preheat the oven to 350°F (175°C). Lightly butter a 9×9 square baking pan. For easy removal, line the pan with parchment paper leaving overhanging ends.
02 -
Stir the lemon juice into the half and half and set aside to slightly curdle.
03 -
In a stand mixer or with electric beaters, cream the butter and sugar until fluffy and pale yellow. Beat in the egg and vanilla extract, scraping down the bowl as necessary.
04 -
Take 1 tablespoon of the flour and toss with the sliced rhubarb to coat.
05 -
In a separate bowl, whisk together the remaining flour, baking powder, and salt.
06 -
Add half of the flour mixture to the butter mixture and blend. Add all of the half and half mixture, blend, then add the remaining flour mixture and blend just until combined. Do not overmix. Fold in the flour-coated rhubarb gently.
07 -
Spread the batter into the prepared pan and sprinkle the top evenly with the reserved sugar. Bake for 40-45 minutes, or until golden and a toothpick inserted in the center comes out with just moist crumbs.
08 -
Allow the cake to cool slightly before cutting into squares and serving.