Steps

1. Scrape off the bumps on the sides of 1 cucumber with the back of a knife.
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2. Trim both ends of the cucumber and slice thinly into rounds.
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3. Sprinkle a pinch of salt on the sliced cucumber rounds and let sit for 10 minutes.
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4. Finely chop the 50g of takuan.
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5. In a bowl, mix together 1 tbsp mayonnaise and 1 tsp paste mustard.
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6. Add the chopped takuan and the drained canned tuna to the mixed seasonings and combine well.
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7. Squeeze out the water from the cucumber that was salted and let sit for 10 minutes. Add it to the bowl. 【Key Tip!】 Salting the cucumber removes moisture, preventing the bread from becoming soggy and ensuring a delicious result.
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8. Add the squeezed cucumber and the prepared tuna-takuan mixture to the bowl and mix well.
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9. Spread butter (or margarine) (to taste) on one side of the 4 slices of bread (8-slice cut). 【Key Tip!】 Toasting the bread to your preference also makes it delicious.
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10. On the buttered side of the bread, spread half of the mixed filling.
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11. Spread butter (or margarine) (to taste) on the other side of the bread slices and sandwich the filling.
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12. Place a cutting board or similar item on top and let it rest for about 5 minutes.
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13. Trim the crusts if desired.
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14. Cut into your preferred size.
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