01 - 
                Peel the shells off the shrimp and place shells in the middle of the cheesecloth. Gather ends and tie with twine to form a pouch.
              
              
              
                02 - 
                Heat the oil in a large stockpot over medium high heat and add the onions. Sauté for about 10 minutes until the onions soften and just start to turn color.
              
              
              
                03 - 
                Stir in tomato paste and cook just until the paste starts to lose its bright color.
              
              
              
                04 - 
                Add in the oregano, salt, and pepper and stir to combine. Continue to cook until it starts to develop a fond - when bits of the tomato paste start to stick to bottom of pan and everything becomes fragrant. Don't burn it.
              
              
              
                05 - 
                Slowly pour in the water and stir to scrape up any brown bits on bottom.
              
              
              
                06 - 
                Add the pouch of shrimp shells into stock and push it down to fully cover. The water should cover the pouch.
              
              
              
                07 - 
                Bring to a boil then lower to a simmer and simmer for 30 minutes.
              
              
              
                08 - 
                Remove pouch and carefully squeeze out any juices by pressing against side of pan using back of spoon. Discard pouch.
              
              
              
                09 - 
                Crush the angel hair pasta and add to stock. Cook for 3 minutes until al dente.
              
              
              
                10 - 
                Stir in evaporated milk. Add a little water into the empty can to make sure you get every bit out. Add in the shrimp and cook for 2-3 minutes until the shrimp turn pink.
              
              
              
                11 - 
                Turn off heat. Crumble in the feta leaving some in chunks. Stir and serve.