Schultz Concrete Company foreman Al Grayson, 42, mixed up a home-made vat of his finest concrete blend Tuesday for Brenner Construction employee Charles Jacobin, after inviting his favorite customer to 'follow [him] 'round back for the good stuff.' 'Charlie's been coming to me for years, and I know exactly how he likes it,' said Grayson, adding that his special batch isn't the kind that lasts just long enough to satisfy the inspectors but then falls apart. 'This is concrete the way my grandfather made it, with just a touch of gypsum. There was only one bag left, so I tucked it away for my main man Charlie.' While Grayson refused to divulge his secret recipe, he did claim to use only organic cement, artesian well water, and 'enough quartzite to make any sidewalk sparkle.' 