What characteristic defines wines from 'premier cru' vineyards in Burgundy?

The characteristic that defines wines from 'premier cru' vineyards in Burgundy is that they exhibit concentrated flavors due to vineyard aspects. Premier cru vineyards are designated sites known for their ability to produce high-quality grapes, which results in wines that reflect the unique terroir of the specific vineyard. Factors such as soil composition, slope, sun exposure, and microclimate all contribute to the concentration of flavors in the wines produced from these vineyards. Consequently, wines from premier cru sites tend to show a greater complexity and depth, making them distinct from lower-level classifications.

This embodies the essence of terroir in Burgundy, where the specific characteristics of the vineyard can significantly influence the wine's flavor profile and quality. The focus on vineyard aspects highlights the notion that premier cru wines are not merely products of the grape variety but are deeply interconnected with their origin.