4 slices bacon (cut into 1/2-inch-wide pieces)
1/3 cup sugar
1 tablespoon sesame seeds
6 medium sweet potatoes (6–8 ounces each)
2 large eggs
3 tablespoons unsalted butter, room temperature
2 tablespoons white miso (fermented soybean paste)
1 2/3-inch piece ginger, peeled, finely grated (about 2 teaspoons)
2 1-inch pieces scallion (dark-green parts only), thinly sliced lengthwise