Bring a large pot of salted water to a boil. Add potatoes and cook for 10 to 12 minutes. Drain and set aside until cool enough to handle.

Meanwhile, combine remaining ingredients. Wait until herb cubes are defrosted and then mix well (you can also substitute this with ready-made pesto).

Preheat grill to medium (400 degrees Fahrenheit). Place a large piece of heavy-duty foil on a work surface. Place potatoes on the foil and toss with pesto to coat. Wrap foil loosely around the potatoes and place on grill. Grill for about 10 to 15 minutes, stirring often, until potatoes are soft on the inside and lightly browned on the outside.