Begin by boiling your udon noodles for a minute and drain.
Add your oil to a skillet over medium heat and add in all of your sauces and spices - soy, sriracha, rice vinegar, gochujaru, and sugar.
Let the sauce simmer for about 30 seconds or so on low heat until the sugar dissolves and then add in your udon.
Mix everything well until the sauce thickens and coats the noodles evenly.
Serve with scallions or tofu! Also, these noodles taste great with fried eggs. I tried this recipe with vegan "Just Egg" and it was amazing.