Turn on the Saute mode on the Instant Pot and add the sesame oil.
Once the oil is hot, add the garlic and saute for a minute until fragrant. Then add the veggies and continue to saute for around 4 minutes until tender (they should be crisp, and not overcooked).
Hit Cancel and keep the veggies aside in a bowl.
In a small bowl, whisk together the ingredients listed under ‘sauce’. Check for seasoning, and add salt or adjust chili sauce if needed.
Add the sauce to the Instant Pot, followed by 2+¼ cup water. Whisk to combine.
Break the lo mein noodles and place them in the Instant Pot. Push them down to submerge them as much as possible.
Close the lid of the Instant Pot and Pressure Cook for 4 minutes. Once the cooking cycle is complete and the IP beeps, manually release pressure (quick release).
Add the reserved veggies, and add a the juice of half a lemon.
Using tongs, gently toss the noodles and veggies.
Garnish with toasted seasme seeds, crushed peanuts and serve.