Preheat a large saut pan over high heat with 3 turns of the pan of EVOO, about 3 tablespoons. Cook the ground sirloin until browned, 7-8 minutes. Once the meat is brown, season it with salt and pepper.
While the meat is browning, add the oregano, thyme, parsley, garlic and onion to a food processor and pulse the machine to finely chop everything. With the machine running, stream in the vinegar and remaining 1/2 cup of EVOO. Season the herb sauce (in Argentina this is called a chimichurri) with salt and freshly ground black pepper. Add half of the chimichurri to the skillet with the meat, mix to combine.
In a small bowl, combine the tomato sauce, paprika, Worcestershire sauce and brown sugar. Add the sauce to the pan, then bring everything up to a bubble and simmer for 2-3 minutes, until slightly thickened.
To serve, spread the remaining chimichurri on the toast bun tops and spoon the Tango Joes onto the bottoms. Replace the tops and enjoy!
This is one of many "Yum-o!" recipes it's good and good for you. To find out more about Yum-o!, Rachael's nonprofit organization, go to www.yum-o.org.