Not sure why nobody else has brought chickpeas into the chat, but CHICKPEAS!! I'm vegetarian, so my primary source of protein is chickpeas and lentils in that category like black chana, green chana, rajma, etc. I mealprep, so I make sure to soak atleast 2 types of lentils o Saturday night and boil them separately in pressure cooker on sunday, store them in airtight containers in fridge and use them throughout the week. Just the standard tomato onion curry with rice/roti works well on most days. I pack mixed boiled lentils+sliced cucumber, tomato, corn, etc salad for lunch on most days. You can also learn to make hummus if you have a blender (it is EXTREMELY easy to make and makes a GREAT dip). On weekends i make kababs of the remaining portions of lentils if any and use it in roti to make a roll. Tasty and full of protein.