Millennials are passionate about caring for the earth. They want to know that they are supporting eco-friendly businesses. Some ideas for being more eco-friendly include using more sustainable fuels, reducing single-use plastics, adding vegetarian dishes to your menu, learning zero-waste cooking methods, and making more foods from scratch. If you are really serious about sustainability, you might consider investing in solar panels for your food truck. Solar panels can be pricey up front, but they require little maintenance, last many years, and will more than pay for themselves in a short time.