BJCP Style 4: Dark Lager
4C.  Schwarzbier

Examples: Kostritzer Schwarzbier, Samuel Adams Black Lager
Serving Temp: 40°- 45°
Glassware: Pilsner, Pint, Seidel or Stein

Aroma: Hints of roasted malt that can be coffee like (but never burnt) are present.
Appearance: Pours dark brown with garnet highlights around the edges and a long lasting tan head.
Flavor: A light biscuity malt sweetness balanced by a light bitter-chocolate layer, noble hops (herbal/spicy) and a clean lager finish.
Mouthfeel: Medium body and smooth.

Food Pairings: Cuisine: German, Mexican or other hearty and/or spicy foods. Meat: smoked or grilled.

HopHeadSaid: This subcategory is my favorite of the Dark Lagers.   Schwarzbiers are a perfect mix of sweet malt, smooth bitter chocolate and just a touch of roastiness. The beer also has a crisp and refreshing lager quality.  This is great beer to pair with other foods because its moderation (flavor, alcohol and body) keep the beer from dominating any pairing. Also, its light roastiness resonates with many grilled or lightly smoked meats.

BJCP Style 4: Dark Lager
4B.  Munich Dunkel 

Examples: Gordon Biersch Dunkels, Hofbrau Dunkel, Konig Ludig Dunkel
Serving Temp: 40°- 45°
Glassware: Pilsner, Pint, Seidel or Stein

Aroma: A complex malt sweetness that includes bread crust, hints of caramel or toffee and a touch of chocolate.
Appearance: Pours a dark copper to brown with garnet highlights with a creamy tan head.
Flavor: As it smells, light bread crust with a very light but sweet caramel/toffee and bitter chocolate layer.
Mouthfeel: Medium-full, rich smooth texture and a pronounced

Food Pairings: Cuisine: German or other hearty and/or spicy foods Meat: smoked or grilled meat.
HopHeadSaid: Coming Soon!

BJCP Style 4: Dark Lager
4A.  Dark American Lager 

Examples: Dixie Blackened Voodoo Lager, Heineken Dark Lager
Serving Temp: 40°- 45°
Glassware: Pilsner, Pint

Aroma: Little or no malt (slight roast or caramel if any) or hop (hint of spice if any) aromas.
Appearance: Pours dark amber to brown with red highlights with a short-lived light tan head.
Flavor: Crisp and clean with low levels of caramel sweetness.  There may be a hint of coffee or molasses but strong roasted malt flavors should not be present. Hop bitterness is low.
Mouthfeel: Smooth, medium body

Food Pairings: Cuisine: German or other hearty and/or spicy foods. Meat: smoked or grilled meat.

HopHeadSaid: Even though the subcategory says Dark American Lager you can see that there are international examples as well. As a matter of fact Heineken Dark Lager spent some time as my go to beer.  This is an incredibly easy drinking style with a clean lager taste (very little fruitiness), sweet caramel and cocoa notes and very little bitterness.