How do I open this?

Today we had a lazy morning then mummy and I went to visit papa and he looked after me for a while as mummy had to go run some errands. Then we stayed at granny and papa's for dinner. I'm still not eating very well today as my gums are very very sore so I'm not feeling my best today :( I did manage to show off my walking skills to granny, papa and uncle Paul though :) now if only my gums weren't so sore I could maybe try one of these egg things!