Cut the red bell pepper into chunks and slice the optional jalapeño, then set them to the side.
Add the cornstarch to another bowl, then take the shell-on shrimp and coat them in the cornstarch thoroughly before setting them to the side.
For the seasoning, combine the salt, sugar, and lots of black pepper, and mix until well combined.
Add enough oil to a pan to shallow fry and heat over medium-high. Fry the shrimp for about 3 minutes per side, removing them once crispy and golden.
Add a bit of oil to a separate pan and add the peppers, cooking until slightly softened. Add the minced garlic and cook until fragrant.
Add the crispy shrimp back in, sprinkle over the seasoning mixture, and toss until everything is well coated.
Serve over a fresh bowl of rice. Optionally garnish with a little more of the seasoning. But it's your food, you eat it how you like.