Preheat the oven to 350° F/ 175° C.
In a wok or other pan, brown the spring onions in olive oil until soft - about 3-5 minutes.
Add spinach, salt and pepper and sauté until wilted, about 5 minutes. Turn off the heat.
Add chopped dill and parsley and mix well.
Chop the wiener sausages into pieces as described – optional but tasty.
Chop the feta style cheese into small cubes – around ½ cm in size, - so quite small – add cheese pieces (and sausage if using) to spinach mixture and mix well.
Pour the olive oil for brushing in a cup or small bowl. Use straight from the pan or transfer to a smaller bowl.
For Sainsbury’s brand filo you want a large deep baking dish, that is around 28 by 32 cm long – annoyingly they don’t put the size if the sheets on the packet!!!!!
You can trim the filo long ways to fit the length of your pan, once you’ve unrolled them – if you wish. But don’t unroll the sheets until you are ready to assemble the dish or they will start to dry out and break.
Brush the bottom of a 28cm by 32cm baking pan with a little bit of oil.
Count the sheets – usually 11 or 12 – depending on numbers, work out how many sheets to have in each layer. Could be 4, 3 and 4 if 11 sheets in pack or 4, 4 & 4 if 12.
Then line the pan with one filo sheet, and brush the top with a thin coating of olive oil.
Put a total of 4 sheets in the bottom brushing the top of each sheet like the first one.
Then spread half the spinach and feta mixture evenly on top of the sheets, then add another 3 or 4 sheets also brushed with oil.
Then spread the remaining feta mixture.
Then add the last 4 sheets – brushing with oil as before.
When assembly is completed, cut into squares – I suggest 3 lengthways and 4 across the width – but whatever works for your number of guests/portioning is fine.
Bake for 60-70 minutes until it is golden brown on top. Begin checking at 50 minutes as ovens vary.
You can serve it hot as a main dish, or it can be eaten cold or warm as a snack or starter – works brilliantly with hummus.