In large pitcher, stir together wine, blood orange juice, cognac and simple syrup. Stir in orange slices.
Cover and refrigerate at least 1 hour or up to 3 days. Serve over ice.
Notes
Home Chef Tip: To make a small batch of simple syrup, stir together 1/2 cup water and 1/2 cup granulated sugar in small pot. Cook over medium heat 4 to 5 minutes or until sugar is dissolved. Remove from heat; let stand 10 minutes. Transfer to jar or container and refrigerate until completely cool, or up to 5 days. This will make about 4 ounces of simple syrup, plenty for this recipe.
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