Tomatoes are baked with a topping of mayonnaise, cheese, mustard and oregano. They make a great side dish or meat free appetizer.
I have made these tomatoes for years. Make sure you slice the tomatoes thick and try just broiling them for a few minutes till brown and bubbly rather than baking them. The tomatoes stay firmer and not so mushy as the baked ones. I also always add oregano and omit the mustards. Sometimes I even add a little garlic. - 08 Jan 2007 (Review from Allrecipes USA and Canada)
You know, this isn't a complex dish and the preparation is simple and basic. But that doesn't mean it isn't worthy of five stars and in my opinion, this is. What a dressy alternative to just sliced tomatoes! I prepared this with the two mustards just as written and it proved to be a winning combination. The tang of the mustard and Parmesan was the perfect complement for the mellow mozzarella. I used fresh rather than dried oregano as I'm lucky enough to have it in my garden. A quick finish under the broiler browned these up nicely. This is easy, uses quality ingredients, is pretty on the plate and, most important, is full of delicious flavor too. - 21 Jul 2011 (Review from Allrecipes USA and Canada)
This was really yummy!! The kitchen smelled so good while it was cooking!! The changes I made were as follows: omitted brown mustard, used fresh basil instead of parsely,sprinkled the s&p directly on the tomatoes & I used garlic mayo.I also broiled them for a minute to brown the top.Will deffinately make again!! - 08 Sep 2005 (Review from Allrecipes USA and Canada)