Irresistible Raspberry Swirl Brioche

Ingredients

• 1 tsp lemon zest (skip this if you want)
• 1 tsp vanilla extract
• 2 big eggs, room temp
• 4 tbsp soft unsalted butter
• ½ cup milk, warmed (about 110°F)
• ½ tsp salt
• ¼ cup sugar (just regular granulated works)
• 2 ¼ tsp active dry yeast (basically one packet)
• 3 ¼ cups plain flour
• 1 tbsp butter, melted (for brushing the top)
• 2 tbsp water
• 1 tbsp cornstarch
• 1 cup raspberry jam or preserves
• 1 tbsp cream or milk
• 1-2 tbsp lemon juice
• ¾ cup icing sugar