I used to cut off the corner and squeeze it out like a wormDairylea cheese triangles. In my day you had to try and unpeel the foil which was really tricky. Or use your teeth to bit into the foil which really grated on your fillings. Or get a sharp knife and cut down the middle which meant you had to dig out both sides of the triangle, leaving quite a lot in the corners. Now there is a little red strip which handily removes the wrapping. Without any effort. Kids today.