Vegan Baked Beans

Heat oil in a large saucepan over medium-high heat. Add onion and cook, stirring occasionally, until browned, 6 to 10 minutes.

Add beans, water, ketchup, maple syrup, vinegar, mustard, salt and pepper. Bring to a boil over high heat. Reduce heat to a simmer and cook, stirring occasionally, until beans are very tender and the liquid has thickened, about 30 minutes.