Originally found on a can of Clover Leaf salmon, I have enjoyed this easy recipe for many years. While in the Philippines, it partnered well with the rice staple there, and, when salmon, broccoli and/or dry mustard were not available, canned tuna, frozen mixed vegetables and regular mustard worked as substitutes. You might come up with your own adaptation!I also prefer a bit more flour, adding an extra ½ -1 tbsp, for a thicker consistency, and like experimenting with different cheeses. A few more minutes’ bake time, too, allows the topping to brown a bit.