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Home » Main Ingredient » Bread

Cultured Butter Rusk Crusts

August 23, 2023 by Marc Matsumoto Leave a Comment

White mug with sweet and buttery Japanese rusk.

One thing that sets Japanese panko apart from its Western counterparts is the fact that the crusts of the bread are removed to make pure white breadcrumbs from the fluffiest parts of the bread. This is one of the reasons panko creates such an ethereally crisp crust. The problem, of course, is that you're left with the crusts to contend with. I hate wasting food, so I've found a few ways to use them up. Croutons and bread pudding are a few tasty uses, but my favorite method of using crusts is to make rusk. 

Rusk is one of those obscure European foods that the Japanese have picked up and turned into an entire genre of confections. I imagine it started here as a way to reduce food waste, but today some bakeries are better known for their rusk than they are for their bread. 

Mug cup filled with crispy Japanese rusk.

The concept is simple, take almost any cake, pastry, or bread. Saturate it with butter, and then apply a liberal dusting of sugar before baking it until the bread is crisp and the sugar juuuust starts to caramelize. 

My trick for next-level Japanese rusk is to use cultured butter. Cultured in this context just means the cream has been fermented before being churned. The result is a butter with a high concentration of diacetyl, the compound responsible for giving butter and cheese its distinctive taste. Put another way; this makes my rusk taste like a decadent cheesecake with a crisp texture that melts away in your mouth. 

White mug with sweet and buttery Japanese rusk.

Cultured Butter Rusk Crusts

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Prep Time 5 minutes mins
Cook Time 30 minutes mins
Total Time 35 minutes mins
Yield 8 servings

Units

Ingredients 

  • 150 grams sandwich bread crusts
  • 3 tablespoons cultured unsalted butter
  • 2 tablespoons evaporated cane sugar
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Instructions

  • Put 3 tablespoons cultured unsalted butterin a large glass bowl and microwave at 500 watts for 1 minute or until the butter is mostly melted. Whisk it together to emulsify the butter.
    Mixing melted butter in a glass bowl.
  • Add 150 grams sandwich bread crusts into the melted butter and toss with your hands to soak an even coating of butter into the surface of each piece.
    Sandwich bread crusts coated in melted cultured butter.
  • Sprinkle 2 tablespoons evaporated cane sugar onto the buttered bread crusts in several additions, tossing with your hands in between each addition (you’re allowed to snack on one at this point).
    Sandwich bread crusts dusted with sugar.
  • Lay the buttered and sugared bread onto a parchment-lined baking sheet and place it on the middle rack in the oven.
    Buttered and sugared bread crusts on a parchment lined baking tray.
  • Set the oven to 300°F (150°C) and bake the rusk for 15 minutes.
  • Flip the bread over and continue baking until the bread is crisp (no moisture remaining), about 15 more minutes.
    Flipping sandwich bread crust rusk halfway through baking.
  • Allow the rusk to cool on a wire rack, store it in a sealed container or zipper bag, and snack accordingly.
    Finished crispy rusk crusts dusted in sugar.

Nutrition

Calories 100kcalCarbohydrates 12gProtein 2gFat 5gSaturated Fat 3gPolyunsaturated Fat 1gMonounsaturated Fat 1gTrans Fat 0.2gCholesterol 11mgSodium 123mgPotassium 24mgFiber 0.4gSugar 4gVitamin A 131IUCalcium 41mgIron 1mg
Course Dessert, Snack
Cuisine Japanese

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Marc Matsumoto

Welcome!

I started No Recipes back in 2007 as a place to share original dishes I'd created with friends. It's since evolved into something much bigger than I could have imagined, but as it grew, the focus shifted from inventing dishes to improving classics. In the spirit of how No Recipes began, I'm bringing back my weekly original recipes for all of my supporters and friends!

About Me

Marc's Favorites

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