介绍一下blutwurst和frog's legs。（英文）

blutwurst

This is a spicy and salty German blood sausage made from pork, beef, and beef blood. Germans like to snack on it, or mix it with sauerkraut. It comes already cooked, but it's usually heated before being served.

参考：http://www.foodsubs.com/MeatcureSausage.html

frog's legs

This dish is in the English-speaking world traditionally associated with French cuisine, and a favourite English derogatory nickname for the French is the Frogs. Despite this cliché, frog legs are actually a rare dish in France