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John Miller prepares a Key lime pie with his sons Luke, 13, and Jack, 15, at their Delray Beach home. The boys’ brownies won first place at last year’s Real Men Bake. Tim Stepien/The Coastal Star By Jane Smith The chairman of the Delray Beach Historic Preservation Board grows a Key lime tree in his backyard, just like the one his parents grew in their Swinton Avenue yard. Last year, Chairman Jo…