1Prepare the miso béchamel sauce: In a small saucepan, melt 25 grams of Unsalted butter over medium heat. Add the All-purpose flour and cook, stirring constantly, for 1-2 minutes to form a roux. Gradually whisk in the Milk until smooth. Bring to a gentle simmer, then reduce heat to low and cook, stirring occasionally, for 5-7 minutes until the sauce thickens. Remove from heat and whisk in the White miso paste, Koikuchi soy sauce, Shichimi togarashi, and Black pepper until well combined and smooth.
3Assemble the sandwiches: Take two slices of Shokupan. Spread a generous layer of the miso béchamel sauce on one side of each slice. On one slice, layer half of the Ham, followed by half of the Gruyere cheese. Place the other slice of Shokupan, béchamel-side down, on top to form a sandwich. Repeat for the second sandwich.