I got this recipe off an old show on the Food Network quite a few years ago.
The show was about favourite recipes made by regular folks.
This is a very good standby recipe and is better if you make it a day ahead.
1 cup butter
1 cup granulated sugar
2 cups flour
1 - 1/4 cup rolled oats
juice of 3 lemons
zest of 3 lemons
zest of 1 orange
14 oz can sweetened condensed milk (I use 2 x 300 ml cans)
Make crumb mixture of butter, sugar and flour. Stir in oats.
Make filling by blending juice, zests and milk.
Press 2/3 of the crumb mix into greased 9" x 13" pan.
Pour filling over base and cover with remaining crumb mixture.
Bake at 350F for 30-35 minutes until golden.
Cool, cover and refrigerate.
Recipe cuts better if you make it one day ahead.
I’ve also done this recipe with limes and lemons.