To make this change, just add a courtesyLink to each center recipe. This will override the general one set at the top. Below is an example. This is the Food.com version which is a little different, but the courtesyLink is the same.

courtesylink.js

/**
 * ==========================================
 * Center Results and Impression Logic
 * ==========================================
*/
if( $.inArray( 'pork', keytermSet ) > -1 ){
  var centerRecipe = new CenterRecipe();
  centerRecipe.title          = "Cuban Pork Adobo Salad";
  centerRecipe.clicktag       = "http://ad.doubleclick.net/clk;274204538;98873843;y?http://www.food.com/recipe/cuban-pork-adobo-salad-501729";
  centerRecipe.image          = "http://img.foodnetwork.com/FOOD/2013/06/04/RX-NPB_Cuban-Adobo-Salad_s3x4_sm.jpg";
  centerRecipe.level          = "";
  centerRecipe.cooktime       = "8 minutes";
  centerRecipe.preptime       = "10 min";
  centerRecipe.courtesyLink   = "http://ad.doubleclick.net/clk;272664759;101583304;i?http://www.porkbeinspired.com/RecipeDetail/2770/Cuban_Pork_Adobo_Salad.aspx";
  centerRecipe.ingredients    = "4 New York (top loin) pork chops";
  centerRecipe.impression1x1  = "http://ad.doubleclick.net/ad/N5673.440.SCRIPPS.COM/B7205349.119;sz=1x1;ord=[timestamp]?";
  centerRecipe.description    = "It’s easy to enjoy garden-fresh flavor with the Cuban Pork Adobo Salad. With seasoned New York (top loin) pork chops and grilled pineapple slices on crisp greens, this salad is perfect for family get-togethers and backyard barbecues.";

  matchedRecipeSet.push(centerRecipe);
}