Preheat the oven to 325 degrees. Roll each lemon in aluminum foil. Place on top of a mound of salt with the seam side down. Roast until packages are soft – about 1 and a half hours. Allow to cool. Cut the lemons in half and scoop out the roasted flesh into a sieve (removing any seeds). Using a spoon, scrap the white pith off the remaining lemon peel. Discard the pith and chop the remaining lemon peel.