Depends on how you'll use the boat.
We go out almost every weekend of the boating season and one or two 2-week cruises per year. The last 15 day cruise we were on, we stayed at a marina overnight just one night.Needless to say, we do a lot of cooking aboard. Definitely agree with others that a propane grill is essential if you'll be doing a lot of wilderness cruising. However, we removed the single burner Origo that came with the boat, and replaced it with a double.Greasy grilling stuff gets done in the Force 10 (grill) on the rail at teh back of the cockpit, but pasta, rice, coffee, hot chocolate, soup, stew, bacon and eggs, etc. get done in the galley.Used a propane camp stove in the cockpit for years. Got tired of the noise, set-up takedown, and leaking propane bottles. Then switched to a butane stove. Better but still needed to be hauled out and set up for every use. Love the Origo non-pressure alcohol. Just flick my Bic (lighter)and it's cooking. Heats up just as fast as the others as long as you keep moisture out of the cannister(s) by covering them when not in use.As far as a sink goes, same deal. Not essential, but when permanently mounted, much handier than a bowl or bucket.Disregard everything I said if you only go out for day sails, or by yourself, you'll need neither.