Grilled Leeks With Brown Butter and Spiced Hazelnuts

Name: Grilled Leeks With Brown Butter and Spiced Hazelnuts
Ingredients: 1 cup crushed blanched hazelnuts; ¼ cup sesame seeds; 4 Tbsp. unsalted butter; ¼ cup plus 3 Tbsp. extra-virgin olive oil; 1¼ tsp. smoked paprika; 1 tsp. light or dark brown sugar; 3 tsp. Diamond Crystal or 1½ tsp. Morton kosher salt, divided; 1 tsp. freshly ground black pepper, plus more; 3 garlic cloves; 12 medium leeks or 8 large leeks, white and pale green parts only, roots trimmed, halved, quartered if large; 2 Tbsp. sherry vinegar or red wine vinegar