This isn't based on local ingredients, but it's a great condiment for noodles, vegetables, and even new potatoes.
1/3 - 1/2 cup soy sauce
2 Tbsp rice vinegar
3 Tbsp peanut or canola oil
2/3 cup smooth peanut butter (preferably natural)
2-3 cloves garlic, chopped
1 Tbsp grated fresh ginger
2-3 tsp chili paste
Up to 1/4 cup water
Up to 1/4 cup sugar or honey (optional)
Combine all ingredients in a blender or food processor and process until smooth. Add water as needed to reach desired consistency.
Makes enough to sauce 1 lb of noodles, 2 lbs of potatoes, or vegetables to serve 6.