In a food processor, pulse walnuts until ground. Then add garlic, coriander, fenugreek, salt, and pepper until finely ground. Add vinegar or lemon juice, and just enough water to form a thick but spreadable paste. The consistency should be creamy but not runny.
1 ½ cup walnuts, 2 tablespoon apple cider vinegar/ red wine vinegar, 2 garlic cloves, ½ teaspoon blue fenugreek, ½ teaspoon ground coriander, a pinch teaspoon cayenne pepper, Water to blend, Salt and pepper