Sorry I didn't get back to you sunflower, haven't been on here....
Yes, borage is eible.
Also, just found his snippet fo you:
'Borage is a freely seeding, easy growing annual plant with vivid blue flowers and leaves with the flavour of cucumbers. It is considered a herb, but is often grown in vegetable gardens where it attracts pollinating bees and is considered a good companion plant for tomatoes, squash and strawberries. It’s even supposed to deter tomato hornworms and improve the flavour of tomatoes growing nearby.'