Splash half the soy sauce and half the sweet chili sauce over the turkey breast slices, set aside until the griddle pan is hot, then griddle for 2-3 minutes each side until nicely striped.
Meanwhile, cook the Udon noodles according to the packet instructions (about 2 minutes) and set aside to cool.
Prepare the broccolini by cutting off the florets and slicing the stems into diagonal strips. Stir fry the broccolini along with the red peppers and shallots in a hot wok using groundnut oil until everything has a little bit of color.
Add 2 the garlic, ginger and the remainder of the soy sauce and sweet chili sauce and cook for 1 more minute. Add the Udon noodles and toss to mix.
Serve the noodles piled high with the turkey arranged on top. Finish with a sprinkle of sesame seeds and a drizzle of sesame oil.