这里such as后面省略了代词those,指代“（印度的）素食菜单”.也就是说完整的说是这样——
Many traditional vegetarian diets,such as traditional vegetarian diets common in parts of India,are made up of peas or beans and yogurt.
很多传统素食菜单,比如说印度一些地区常见的菜单一样,是由豆子或豌豆拌酸乳组成的.