In a small saucepan, combine 6 ounces Sercial Madeira with 1/4 cup honey and 1 thyme sprig. Simmer over low heat, stirring, just until the honey darkens, about 5 minutes. Remove from the heat, cover and let stand for 15 minutes. Let the syrup cool, then strain into a jar. Cover and refrigerate for up to 1 week. Makes about 4 ounces.