Prepare the peanut sauce: add all of the ingredients minus the starchy pasta water (this will be added later) into a small bowl. Whisk the ingredients together until combined and set aside.
Cook the veggies: Heat a large, deep skillet over medium/high heat. Add the sesame oil. When the oil is fragrant, add the onion and sauté for 1-2 minutes.
Next, add the matchstick carrots, garlic, and tomatoes to the pan and toss with the onion. Let the veggies sauté for another 2 minutes.
Turn the heat to medium heat and add the broccoli, bell pepper, soy sauce, and lime juice to the skillet. Sauté until the broccoli turns a bright green color and the peppers soften (but aren’t mushy), about 4-5 minutes. Remove the veggies from the heat.
Cook the ramen: Bring a large pot of salted water to a boil. Add the ramen noodles to the water and cook until they are al dente. Remove ¼ cup of starchy pasta water from the pot and set aside. Then, strain the noodles.
Add the cooked noodles to the skillet with the veggies and toss until combined.
Slowly add the starchy pasta water to the peanut sauce, whisking while you add the water until smooth.
Finally, pour half of the peanut sauce over the noodles and veggies. Toss until all the ingredients are coated. Add the remaining sauce to the noodles and veggies and toss one last time*
Top with fresh cilantro, green onions, peanuts, and a sprinkle of sesame seeds.