Misc: what plant provides almost half the world's sugar?

Questions

This drink was advertised as brain tonic when first introduced in 1886? What drink were they referring to?

When tomatoes were first imported from Peru into Europe what were they fondly referred to as?

The Americans refer to them as Potato Chips. What do the British refer to them as?

The pretzel was invented to comply with an order by whom?

What popular catch-phrase of the 70’s appeared in Shakespeare’s ‘Julius Caesar’?