Make sauce: Combine all of the ingredients in a small bowl. Set aside.
Prepare noodles: In a large saute pan, heat the oil over high heat. When you see a wisp of white smoke, add the garlic and cook, stirring, until light brown.
Add the eggs and serrano chiles and cook, stirring, until the eggs are lightly scrambled and barely set, about 1 minute.
Add the shrimp and onion, folding constantly until the shrimp turn pink, about 1 minute.
Add the noodles, basil, tomatoes and sauce and toss to combine for about 3 minutes. Don't be scared to scrape the bits off the bottom before they burn. Cook for 1 additional minute until the noodles are cooked and coated well. Serve hot.