Apart from quiche lorraine, I can't really think of anything else - and there is only so much quiche you can eat LOL. Silver beet doesn't preserve or freeze very well, so it makes it hard when you have a heap of it ready now. I suppose you could make a heap of quiche and freeze that?

ETA - I just had a look in DH's grandma's recipes books we have and there are two recipes if you're up for something different.

Spinach Supreme
Drain and chop the green of one large bunch of spinach (more if needed for large numbers). Add 1 cup of milk and 120grams of kraft or similar cheese. Mix well and place all in a pyrex dish. Cover with another 120grams of grated cheese, and bake in a moderate oven until cheese in melted and slightly browned. Before taking from oven, cover the top with thin srips of bacon and allow bacon to cook to a golden crisp. Serve as a vegetable or as a luncheon dish.

Spinach Loaf
Three cupfulls of cooked spinach
2 tablespoons melted fat
2 tablespoons flour
salt and pepper to taste
1 loaf unsliced bread
butter
1/4 cup milk
1 hard boiled egg

Remove the crust from from a small loaf of bread. Hollow out the centre and refill with the spinach mixture made as follows;
Melt the fat in a frying pan, add the cooked and finely chopped spinach. Cook for 3 minutes. add the flour and the seasonings. Stir well, add milk and cook for 5 minutes. Butter the outside of the loaf well. Stand in the oven and bake until a light brown. Garnish with hard boiled egg, cut into slices.