There’s more than just burgers and shakes to be had at Lincoln Road’s Shake Shack today. The Miami Beach Shack is ready to debut its newly renovated space with a beats and treats party tonight starting at 6:30. To celebrate, the Shack partnered with the Salty Donut to create an exclusive concrete custard topped with a rainbow sprinkle mini doughnut. Available today, May 25, through Sunday, May 28, the Salty Donut concrete – a dense, frozen custard blended at high-speed – features vanilla frozen custard fused with the Salty’s dulce de leche doughnut, along with banana and salted caramel. Each one is garnished with the Salty’s mini chocolate-chocolate doughnut. The treat is priced at $4.69 for a single, and $6.89 for a double.