Mustard seeds are indeed oilseeds rather than pulses. They are the small round seeds of various mustard plants and are widely used in cooking and for extracting mustard oil.

Key Attributes 

1. Varieties: Mustard seeds come in different colors, primarily yellow/white mustard seeds and black/brown mustard seeds. 

2. Culinary Usage: Mustard seeds are a key ingredient in many cuisines globally, especially in Indian, and Southeast Asian cooking.

3. Nutritional Profile: Mustard seeds are rich in nutrients such as omega-3 fatty acids, protein, dietary fiber, vitamins (like Vitamin B complex, Vitamin E), minerals (including calcium, magnesium, and phosphorus), and antioxidants.

4. Health Benefits: Mustard seeds are believed to offer health benefits, including aiding digestion, providing relief from respiratory disorders, and potentially containing anti-inflammatory properties.

5. Flavor Profile: The flavor of mustard seeds varies depending on the type—yellow mustard seeds offer a milder taste, while black mustard seeds have a more intense, spicy flavor.