Rhubarb Bars with Shortbread Crust

Bahan-bahan (9 porsi)

• 1 cup butter (softened (2 sticks))
• 3/4 cup granulated sugar
• 1 & 1/2 teaspoons vanilla
• 2 cups all-purpose flour (spooned and leveled)
• 3/4 teaspoon kosher salt
• 3 cups rhubarb (chopped (about 5 stalks))
• 1/2 cup grenadine syrup (to be drained eventually*)
• 3/4 cup sugar
• 1/4 cup all purpose flour
• 1 tablespoon lemon juice (optional)
• 1 teaspoon lemon zest (optional)
• 1 cup powdered sugar
• 2 -3 teaspoons milk (more or less to taste)
• 1/2 teaspoon vanilla
• pinch salt