According to popular folklore, if these foods are eaten on New Year’s Day, you’re guaranteed good luck throughout the year: Peas and beans symbolize coins or wealth. Choose traditional black-eyed peas, lentils, or beans to make a dish seasoned with pork, ham, or sausage. Greens resemble money, specifically folding money.
https://www.thespruceeats.com/southern-new-years-day-dinner-3057537