In an effort to spread word of the vegan lifestyle, Beyonce and Jay-Z are offering fans free tickets for life to their concerts if they try the plant-based diet.

The couple, who have openly talked about working toward a more plant-based diet, are asking fans to join the meal-delivery service 22 Days Nutrition. The company, which was co-created by the couple and their personal celebrity trainer Marco Borges, offers organic, vegan, soy, and gluten-free delivered meals to its clients each month.

“The benefits of a single plant-based meal a day can have such a profound impact on our health and the environment, spanning from cutting carbon emissions to conserving water,”  the duo said in a statement.

While Beyonce and Jay-Z haven’t completely converted to a Vegan diet, the duo has been making an effort to be conscious of what they eat. Beyonce shared that she will begin meat-free Mondays and eat solely plant-based breakfasts while Jay-Z said that two of his meals each day will be plant-based.

“We want to challenge you as we challenge ourselves to move towards a more plant-based lifestyle and acknowledge you for standing up for your health and the health of the planet,” they said.

The competition will be launched through the Greenprint Project, which was created to ensure “the positive impact we can have on the world by eating plant-based meals.” The Greenprint Project Sweepstakes will run through April 22 and all U.S. residents above age 18 are eligible to enter. One prize is available: a pair of tickets to either Beyonce or Jay-Z’s concerts for life, up to a maximum of 30 years.

Apply for the sweepstakes here.