Raita is a sauce or dip usually used with Indian or Pakistani food. It's actually got A LOT in common with a variety of other yogurt based sauces from other cultures, such as Tzatziki, the Greek sauce. I should probably just call it "yogurt cucumber sauce", but ... I didn't.
Because I wanted to keep it basic, which allows you to add it to a wider variety of things, I chose to leave it really basic. It's a REALLY nice way to complement some hot grilled chicken on a scorching summer day. Add a little cumin, coriander and some cayenne and it becomes a wonderful accompaniment to lamb. Throw some spicy beef and chilies into a low-carb pita
and slather this stuff on it.
Ah, I suppose I should mention the "English" cucumber. These are the cucumbers you'll often see wrapped in tight plastic. These are a little longer, thinner and slightly sweeter. They also have softer seeds and thinner skin. This makes them a little more of a pleasant cucumber, all around!
Here's a picture!