'We've Served Over 2 Million': Their Milkshake Went Viral and Helped This Local Burger Joint Grow Into a Global Brand

'We've Served Over 2 Million': Their Milkshake Went Viral and Helped This Local Burger Joint Grow Into a Global Brand Julie Mulligan, co-founder and CEO, shares the secret ingredients to Black Tap's worldwide growth and brand expansion. Key Takeaways In 2019, Julie Mulligan and her husband Chris…