How do you help your clients who are vegetarian with thier nutrition?

My client who has been training with me for 6 months now is on a restrictive diet. He is not vegan but he does not eat meat or eggs. As a meat eater I am finding it difficult to give him guidance as he progresses. He asks me regularly for recipies and for more information regarding athletes and weightlifters who are vegetarian. Although I do search online I am not coming up with a lot of information about athletes and weightlifters on vegetarian diets. Another question vegetarian clients need as much protein as meat eaters to build and maintain muscle?