Instructions

1. Preheat oven to 350F. Line a loaf pan with parchment, or grease with vegetable oil.
2. In a small saucepan, brown the 1/2 cup unsalted butter. Remove from the heat and pour into a large mixing bowl to cool.
3. To the brown butter, add the 1 cup sugar. Add the 1 egg to a liquid measuring cup and then add milk to make one cup. Add this to the mixing bowl with the butter and sugar. Whisk well. Then add the 1 ripe banana, mashed with a fork, and whisk until everything is well combined.
4. Finally, fold in the flour, baking soda, and salt. Stop folding when there are still a few streaks of dry flour left.
5. Separate 1 cup of the batter to a smaller bowl, and mix in the black sesame butter until incorporated.
6. For the other ⅔ of the batter, fold until there are no dry streaks of flour left.
7. Pour some of the brown butter batter into the prepared loaf pan, then dollop on some of the black sesame batter evenly on top. Alternate the two different batters, and swirl with  a knife id you’d like.
8. When all the batter has been used, bake for 45-60 minutes, until the loaf is risen and golden brown on top, and a toothpick inserted in the middle comes out clean.
9. Let cool in the pan before removing.