Press the saute button on your instant pot. Wait for the screen to say "hot".
Add the olive oil, bell pepper, and onion to the instant pot.
Cook, stirring occasionally, until the vegetables begin to soften. About 3 minutes.
Stir in the minced garlic and cook until fragrant. About 1 minute.
Pour in the water and deglaze the bottom of the pot, scraping up any bits of food that may have stuck to the bottom.
Press the cancel button on your instant pot.
Mix in the black beans, vegetable stock, red wine vinegar, salt, pepper, oregano, cumin, and bay leaf.
Close the lid and set the pressure release valve to "sealing".
Press the manual or pressure cook button and set to 25 minutes on high pressure.
Once cooking is completed, all the pressure to naturally release for at least 10 minutes.
Quick release any remaining pressure.
Remove one cup of beans and mash them up with a fork or potato masher.
Mix the mashed beans back into the remaining cuban black beans.
Serve and enjoy!