Broiled Salmon with Spicy Maple Sauce

6 tablespoons maple syrup
1/2 cup water
2 tablespoons fresh gingerroot -- peeled and minced
2 cloves garlic -- minced
1 teaspoon dried hot red pepper flakes or to taste
1/4 teaspoon salt
4 (6 ounce ea) salmon fillets -- 1" thick

In a small heavy saucepan combine maple syrup, water gingerroot, garlic, red pepper flakes, and salt and simmer until reduced to about 1/2 cup.

Cool basting sauce and preheat broiler.

Arrange salmon, skin sides down, on oiled rack of broiler pan and season with salt. Broil salmon about 4 inches from heat 4 minutes. Brush salmon with sauce and broil until just cooked through, about 6 minutes more.