Hi, welcome to the forums, have you received the intro information from
@daisy1.
I am sure you will get lots of ideas, there are some in the "what have you eaten today" threads, are you following any specific eating regime? What you choose to eat may also depend on what medication (if any) you are taking for your diabetes.
I am LCHF vegetarian; some of the things I have taken for lunch are:
left overs from previous nights dinner
home made soup
eggs - make scrambled eggs in microwave
salads
cucumber, olives cube of cheese (my typical packed lunch)
lidl protein roll with cheese salad