Place potatoes in a large saucepan; cover with water.

Bring to a boil; reduce heat and simmer 15 min or til tender.

Drain; return potatoes to pan.

While potatoes cook, heat oil in a small saucepan over medium heat.

Add mustard seeds; cook 2 min or til seeds begin to pop.

Add milk, syrup, and turmeric; simmer til reduced to 1/2 c (about 10 min).

Add milk mixture, salt and pepper and mash to desired consistency.