Since most vegetarians don’t get enough protein and aminos, they usually do well with the V-Diet since it fixes that problem. The addition of plain German creatine (5g per day) is also good for them since a meat-less diet means they can’t naturally get muscle-building creatine in their diets.
A vegetarian HSM should be clean, of course, and things like hummus can provide some protein (beans and seeds) and good fats (olive oil). Add a pile of vegetables and avoid the junk dressings and you’ll be fine. Beans have their drawbacks being so starchy, but vegetarians are pretty hampered given their choice.