Spicy Vegetarian Peanut Noodle Salad

2/3 cup creamy peanut butter
1 tablespoon sesame oil
1/3 cup rice or red wine vinegar
1 tablespoon red chile flakes
1 tablespoon sugar
1 tablespoon Dijon mustard
1 tablespoon coarse ground coriander
2 tablespoons naturally brewed soy sauce
1/2 cup canola oil
1 pound spaghetti, cooked and refreshed
1 English cucumber, halved and 1/8-inch slices
1 red bell pepper, julienned
1 bunch scallions, sliced
1/2 cup chopped roasted (salted) peanuts for garnish

In a bowl, whisk together the peanut butter, sesame oil, vinegar, chile, sugar, Dijon, coriander and soy until smooth. Whisk in the canola oil and check for seasoning. In a large bowl, toss dressing with the pasta, cucumbers, bell pepper and scallions. Check for seasoning.