Tuna Sandwich

Steps

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1. 1
   Prepare a mixture of water and vinegar. Slice the onion and place it in this mixture, letting it sit for about 10 minutes to pickle.
   ▶ ≈0:00
2. 2
   Slice the cucumber to match the bread width, cutting pieces about 3-5mm thick.
   ▶ ≈0:13
3. 3
   Use kitchen paper to thoroughly pat dry the cucumber slices.
   ▶ ≈0:22
4. 4
   Mix softened butter with mustard to create mustard butter.
   ▶ ≈0:35
5. 5
   Drain the pickled onions and squeeze out excess moisture using kitchen paper.
   ▶ ≈0:50
6. 6
   In a bowl, combine canned tuna, sugar, salt, miso, and mayonnaise. Add the squeezed onions and mix well.
   ▶ ≈1:03
7. 7
   Spread mustard butter on the bread slices.
   ▶ ≈1:16
8. 8
   Layer cucumber slices on one bread slice, then place the tuna mixture on top, slightly mounding it in the center.
   ▶ ≈1:24
9. 9
   Top with the other bread slice, butter side facing inward, and press gently.
   ▶ ≈1:31
10. 10
    Wrap the sandwich in plastic wrap and let it rest for about 10 minutes to set.
    ▶ ≈1:37
11. 11
    After 10 minutes, unwrap and cut the sandwich in half, then serve.
    ▶ ≈1:45