Kosher salt
2 bunches broccolini (about 12 ounces), trimmed and halved lengthwise
1 cup kimchi, drained and roughly chopped, plus 2 tablespoons brine, plus finely chopped kimchi for topping
1 tablespoon toasted sesame oil
1 tablespoon packed brown sugar
1 clove garlic, grated
1/4 teaspoon red pepper flakes
1 tablespoon vegetable oil
6 slices thick-cut bacon, chopped
1 red onion, halved and sliced
8 ounces thin dried Chinese egg noodles
1 tablespoon toasted sesame seeds