Diet plan for gaining weight

Hey everyone! So this is the first time Im trying this app, and I thought before using this app that my calorie intake was fine. My current weight is 43kg and I am so vastly underweight that it should be 62 kg for someone of my height. The current diet plan of mine shows that I take 1000 calories less than I should take. Im a vegetarian, So can anyone suggest me how to start and where to start with? Please help, it would be appreciated

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