The Belgian Dubbel is a rich malty beer with some spicy / phenolic and mild alcoholic characteristics. Not as much fruitiness as the Belgian Strong Dark Ale but some dark fruit aromas and flavors may be present. Mild hop bitterness with no lingering hop flavors. It may show traits of a steely caramel flavor from the use of crystal malt or dark candy sugar. Look for a medium to full body with an expressive carbonation.
Traditionally a Trappist Ale, many brew similar "Abbey Dubbels" to try and emulate the originals (Trappist Westvleteren 8, Westmalle Trappist Dubbel & Chimay Première).