In a large (12-inch) nonstick skillet, heat the olive oil over medium-high heat. Add the shrimp and tomatoes with a pinch of salt.
Cook, stirring often, until the shrimp are almost cooked through, about 4 minutes.
Reduce the heat to medium-low. Stir in the pesto sauce and cook, stirring, until the shrimp are fully cooked and opaque, about one more minute.
Divide the shrimp and tomatoes between two plates. Use a rubber spatula to scrape any remaining sauce from the pan and pour it on the shrimp. Serve immediately.
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Notes
It's okay to use store-bought pesto sauce, although it will be inferior to fresh homemade sauce. Try to find a high-quality sauce made with olive oil.
The tomatoes will be partially cooked. If you want them fully cooked, add them to the skillet first and cook them for a minute before adding the shrimp.
You can keep the leftovers in a shallow, airtight container in the fridge for up to three days. Reheat them gently in the microwave at 50% power. You can also leave them cold and use them as a salad topping.