Step 1

Combine the graham cracker crumbs, the sugar, and melted butter together until fully combined. Press the crust firmly and evenly into the bottom of a 9x9 square baking pan. I like to spray it lightly and then line with a long piece of parchment so I can lift out the chilled bars for neater cutting. This is optional. Chill the crust while you make the filling.

Step 2

Put the chopped rhubarb and sugar in a saucepan along with 6 tablespoons of water. Bring it up to a boil and simmer until thick and soft...about 5 minutes. Stir frequently so the fruit doesn't scorch. Puree the mixture until completely smooth. Blend in the vanilla and lemon and set aside to cool.

Step 3

When the rhubarb is cooled blend in the condensed milk.

Step 4

Whip the cream to stiff peaks. Fold in the rhubarb mixture gently but completely. Spread evenly over the crust and put back in the refrigerator to chill for at least 2-3 hours.

Step 5

The bars can be served chilled, or even frozen.