Barcelona, restaurants near the Sagrada Familia

Go to Google Maps and enter Sagrada Familia. Click on the Restaurants block at the top of the page. Icons will pop up with all the restaurants in the area. There's pretty thriving fast food businesses all around it.

... not knowing which type of restaurant you're looking for... check this guide for some ideas: https://www.timeout.com/barcelona/food-drink Unfortunately you can't choose by "area", but in Barcelona, it should not matter as it's not a large city and moving about is easy and fast. Walking or public transportation (safe, clean, efficient and inexpensive) is your best bet.