Open-Faced Sardine and Onion Sandwich

I don’t know what it is, but when I am home alone and my wife and kids are out running errands, I decide to make something a bit naughty. I mean naughty in the sense where I don’t need a comment from any of the family members such as ‘gross’ or ‘what the heck is that?’. This was one of those times. A can of sardines and I have been having a stare down for some time now. You know that can I’m talking about. That can you quickly go past when shopping at the store. Not me. Those cans are something I take a look at carefully, and actually loved those darn little smoked oysters years ago, especially when served on a cracker. Sardines are no exception to that.

You can buy an array of sardines in a can, whether they are boneless and skinless and packed in oil, or mustard, or tomato sauce. For me, I like mine packed in olive oil, and I could not care less whether they are boneless or skinless.

So as I sat alone, and hungry on a Saturday morning, I decided to win that stare down and come up with a pretty darn good open-faced sardine and onion sandwich. If you are scared of sardines, don’t be.

Open-Faced Sardine and Onion Sandwich
Open-Faced Sardine and Onion Sandwich

Let’s get started.


  • 3 whole sardines, boneless and skinless
  • 1 slice of Texas toast, toasted, or standard sandwich slice
  • 2 tbsp Dijon mustard
  • 1/4 cup thinly sliced red onion
  • 1/4 lemon, lightly squeezed

Preheat your oven to 350 degrees. Upon the preheat, add the sardines to a oven safe plate, and place in the oven during the preheat to warm through.

Place your bread in the toaster.

How to make a sardine and onion sandwich
How to make a sardine and onion sandwich

When the bread has toasted, remove it from the toaster and slather on the Dijon mustard, from edge to edge.

Place on half of the sliced onions on the mustard. Remove the sardines from the oven and arrange them on the toast.

Place the remaining onion onto the sardines, and squeeze a bit of lemon over the top.

Open-faced Sardine and Onion Sandwich
Open-faced Sardine and Onion Sandwich

Was this sandwich good? Are you kidding me? It was so satisfying. The sardines themselves lend the flavor and texture of what you might expect from tuna, but possibly better in this case. The slight bite of onion along with the tangy lemon and mustard made every bite memorable, especially with the crunch of the toast.

Did I mention how good sardines, in moderation, are good for you?

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Dax Phillips

Thank you for visiting my website. Truly, I do appreciate it. My free time and stress reliever is cooking for my family, friends, and everyone in between. The recipes you find on this site are those that I have either created, been part of, or those that I simply enjoy and have made my own in some shape, form, or other. My focus has always been on comfort food, because at the end of a long work day, you want something comforting. I currently am the father of three children, and married to a wonderful wife of thirteen years. There is nothing fancy with these recipes, just simple, and I will admit, not so simple ingredients, and a simple kitchen corner I can call my own. I learned early on that cooking and bringing family together was very important. After all, this notion of being together at dinner time was instilled early on by my parents. There are many memories of being in the kitchen with my parents, watching them cook, or preparing meals, or those home cooked smells while waiting for dinner. My parents who worked full-time, always had home cooked meals during the week, with the exception of Friday nights where we would enjoy a Wisconsin fish fry, and often on late afternoons on Sunday, where we would order Ann's pizza. I tend to cook by making things up. As a home cook, I think you have to take chances, and add or subtract ingredients that make up a dish, and make them your own. Remember to taste, and taste often. If a dish has potential, try it again, and make it your own. You should also note that I do not count calories, or break down recipes into grams of anything. To me, that's a bit boring. My philosophy is that if the food is good, eat it, and eat it in moderation. Life is just too short not to enjoy good food. Commonly Asked Questions: Can I use your photography/content on my website/blog? Please do not redistribute my photography or recipes without my permission. All of the recipes and photography on this website are my own unless noted, and is subjected to copyright  If you’d like to use a photograph or a recipe, please contact me for permission. Will you review my product/book/site? I am available for recipe development, food photography and/or styling, travel/press events, product reviews, brand promotion/ambassador, and sponsored posts. If you are interested in working with me, or if you have a question/comment regarding a recipe or about my blog, please send me an email.

2 thoughts to “Open-Faced Sardine and Onion Sandwich”

  1. OMG, Dax, you have done it again! This is one of my all-time favorite quick meals. Sometimes I vary it with 2 slices of fresh sandwich bread, untoasted, no mustard, and a whole thin slice of Walla Walla Sweet Onion. Instead of sardines, I get these tiny smoked sprats from Latvia in a round, flat can with a black label. Sometimes these are in grocery stores with an ethnic section, but I can always find them at a Russian store. They are really tiny and quite smoky.

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