Step #1
In a bowl, Dijon mustard, ginger, olive oil, garlic, mix the lemon juice, brown sugar, salt, soy sauce, & pepper.
Step #2 Place the lamb in a shallow container.
Step #3 Pour the lemon juice mixture over the lamb.
Step #4 Cover, & marinate in the refrigerator 8 hrs or overnight.
Step #5 Preheat an outdoor grill for medium heat.
Step #6 Drain marinade, & bring to a boil in a small saucepan.
Step #7 Reduce heat to low, whisking constantly, & let simmer, until slightly thickened.
Step #8 Lightly oil the grill grate.
Step #9 Over indirect heat, grill the lamb 40 to 50 mins, turning to cook all sides, to a minimum internal temperature of 145 degrees F (63 degrees C).
Step #10 Cool, slice, & cover with the thickened marinade mixture to serve.