Tofu and Udon Noodle Almond Butter Stir Fry

Name: Tofu and Udon Noodle Almond Butter Stir Fry
Ingredients: 14 oz extra firm tofu, cut into 1/2 cubes; 1/4 cup potato starch or cornstarch; 1/2 tsp salt; 1/2 cup almond butter; 1/2 cup hot water; 2 cloves garlic, pressed or minced; 2 tbsp chili sauce or sriracha; 2 tbsp soy sauce; 1 tbsp rice vinegar; 1 tbsp sesame oil; 1 tbsp vegetable oil; 10 oz udon noodles; 4 cups broccoli florets and stems; 1/4 head small purple cabbage, thinly sliced; salt, to taste; cilantro or scallions to garnish