London Bunnies: Where to eat lunch tomorrow (10 April) near Holborn/Kings Cross? →[More:]

I've been to London a lot, so I'm hoping to see a couple new things close to each other. (And I love museums.) But I always seem to strike out with regards to lunch. I eat everything, and I'd prefer to spend less than, say, £15, and spend less than 90 minutes at the restaurant/pub/roadside stand/whatever. I'd be happy with, say, a really nice sandwich and a fancy coffee or something, but if there's something special or unusual that I probably wouldn't find in Latvia (everything!) or Los Angeles (less than everything, but still a lot), that's cool too. Bonus points if I can tote it out to Lincoln's Inn Fields and nibble al fresco!

Here's the plan:

• 9:30, arrive Heathrow

• Tube to Holborn

• Sir John Soanes Museum, Lincoln's Inn Fields

• Lunch in your recommended place

• Royal College of Surgeons/Hunterian Museum, apparently on the other side of Lincoln's Inn Fields!

• Train to Luton Airport from Kings Cross, 5:30

Thanks!