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["Melt white chocolate as directed on package; let stand 30 min., stirring occasionally.", "Stir in 2 Tbsp.", "corn syrup until blended.", "(Mixture will resemble consistency of dry mashed potatoes.)", "Cover; let stand at least 4 hours or overnight.", "(It is normal for some cocoa butter to separate out upon standing.)", "Knead white chocolate mixture 3 min.", "or until smooth and pliable (Mixture will be stiff.)", "Divide chocolate mixture in half.", "Knead yellow food coloring and 1 drop red food coloring into one half.", "Roll out to 9x6-inch rectangle; cut into 24 (1-1/2-inch) squares for the cheese slices, re-rolling scraps as needed.", "Knead remaining red food coloring into remaining white chocolate mixture.", "Roll out to 7-1/2x5-inch rectangle; cut into 24 (1-1/4-inch) rounds for the tomato slices, re-rolling scraps as needed.", "Cover ""cheese"" and ""tomato slices"" with plastic wrap; let stand at room temperature until ready to assemble ""sandwiches.""