Recipe: Caramelized Onion Shortbread

Ingredients

• 1 tbsp + ½ cup unsalted butter, divided
• 1 tsp grapeseed oil
• ½ large yellow onion, diced
• ¼ tsp kosher salt
• 1 tbsp granulated sugar
• 1 tbsp red wine vinegar
• ¼ cup icing sugar
• 2 tsp finely chopped fresh thyme leaves
• 1 cup + 2 tbsp all-purpose flour
• 1 tbsp raw pumpkin seeds
• 1 tbsp raw sesame seeds
• 1 tbsp poppy seeds
• 1 egg white
• 1 tbsp water