HERZLIYA, Israel—Israeli foodtech firm SavorEat on Tuesday launched a plant-based burger system personalized to each customer, one of the first companies to use 3D printing technology to cook food. Typically, vegan burgers from companies like Impossible Foods and Beyond Meat are frozen and later cooked on a grill. SavorEat’s technology, however, are made on site by a self-contained 3D printer with three cartridges containing oils and other ingredients. Customers can choose how much fat and protein they want in each burger, which takes about six minutes to cook. “It’s a mix of innovation of meat alternative and digital manufacturing where we can also cook the product,” Racheli Vizman, SavorEat’s chief executive, told Reuters. She said the firm’s burgers are made with a combination of potato and chickpea and pea protein. Demand for meat alternatives by health and environmentally conscious consumers has jumped in recent years, while alternative protein startups raised …