We suggest asking the chef at the supper club. We’re not trying to avoid your question, but there are thousands of recipes that blend the ingredients you mention in various combinations, and we would hate to be responsible for disappointing your husband (and you) by guessing the wrong one. Many chefs are honored to be asked to share their recipes; if yours isn’t, send us his name and address and we’ll try to shame him into it.
How do I determine how much orange oil to use in place of grated orange peel? What would the ratio be?