Put all the ingredients in a bowl, mix, mix, mix and transfer to serving plates. That's it! (If you're using canned tuna in oil, drain the oil beforehand.)
I added canned corn here.
With macaroni and cucumber!
With mizuna instead of hijiki seaweed. Crispy and delicious!
With cucumber and ground sesame seeds (black ones here). Another Cookpad member taught me this variation.
Story Behind this Recipe
I made bean salad quite often. I made this when I couldn't be bothered with chopping up stuff, and just thought "let's just open up some cans!" You'll be surprised by how tasty this salad is, though!
Just mix! I have no tips. It looks pretty nice, so you can make it in a jiffy if you have unexpected guests. Add mayonnaise to taste. It looks pretty decorated with some parsley and cherry tomatoes, if you have them.