Lemon Blueberry Poke Cake

For the cake:

box lemon cake mix

additional ingredients called for on the box to make the cake

For the blueberry sauce:

blueberries (fresh or frozen)

large lemon (zest and juice)

sugar

corn starch

salt

vanilla extract

For the topping:

jarred lemon curd

whipped topping (COOL WHIP)