Preheat the oven to 350 degrees F. Lightly spray or grease an 8 by 8-inch square baking pan and set aside.
Thoroughly combine the oats, sugar, cinnamon, and salt in a bowl. Add the softened butter in large pieces and mix with a fork to achieve a crumbly consistency. Set aside or refrigerate while making the filling.
To make the filling, combine the reserved pear juice with the sugar, cinnamon, vanilla, and lemon juice. Add the drained pears and toss to coat. Transfer the pears to the prepared pan, cover with the topping, and bake 45 to 50 minutes, or until golden brown.
Preheat a convection oven to 325 degrees F, or a conventional oven to 350 degrees F. Lightly spray or grease a 2-inch deep hotel pan and set aside.
Thoroughly combine oats, sugar, cinnamon, and salt in large bowl. Add softened butter in large chunks and mix by hand to achieve a crumbly consistency. Set aside or refrigerate while making filling.
To make the filling, whisk together reserved pear juice with sugar, cinnamon, vanilla, and lemon juice. Add the drained pears and toss to coat. Transfer the pears to the prepared pan, cover with the reserved topping, and bake about 45 to 50 minutes, or until golden brown, and the internal temperature measures 140 degrees F.