Protein is an important part of your diet, just like carbohydrates, fats, and water. Protein molecules bind with amino acids to help build and repair muscle tissue. If you are vegetarian, I recommend keeping track of your protein levels. I was vegetarian for over 2 years and I always kept track of my protein levels to make sure I was getting all the nutrients my body needed to function properly. I love quinoa because it is a complete protein, for protein powders I used hemp, rice, and plant protein. I also ate hummus frequently that would cover fats and protein in a diet. And for extra greens and protein I used spirulina. It is recommend that on a daily basis the average human should consume at least .8 grams of protein per body weight. For example if I am 115 that means (115 x .8 = 92 grams of protein daily). If your active frequently I would increase it to 1 kg/lb, and if your looking for muscle growth 1.2 g or more.
Take a look at some of the ideas on how to use these vegetarian protein sources. Mix them into smoothies, salads, drinks, dinner meals, etc. If you want to learn more on nutrition click here