Trim fat from lamb; cut lamb into 1 1/2-inch pieces.
Coat lamb with cooking spray. Cook lamb in a large nonstick skillet over medium-high heat 4 to 5 minutes or until browned, stirring occasionally. Remove lamb from skillet; set aside.
Add onion and ginger to food processor bowl; process until minced.
Coat onion mixture with cooking spray. Cook in skillet over medium-high heat 3 minutes or until lightly browned. Add lamb, broth, curry powder, and salt. Bring to a boil; cover, reduce heat, and simmer 30 minutes, stirring occasionally. Add potato; cover and cook 20 minutes. Add peas; cook 3 additional minutes.