For the filling, whisk together the eggs, sugar, lemon zest, lemon juice, and flour until all sugar and salt are completely dissolved.
Pour into the crust, until it reaches *just* under the top of the edge (you may have a little left over) and bake for 30 to 35 minutes, until the filling is set.
(I actually tend to like a roughly 60% to 40% filling to crust ratio, so I don't always use all the filling anyway.)