Combine 720ml water, 240ml simple syrup, 8 whole cloves, 3 cinnamon sticks, and lemon peel in a stainless steel pot over medium heat.
Bring to a gentle simmer and cook for 10 minutes to extract the spice flavors.
Add 750ml red wine and stir to combine. Heat slowly until steaming and hot - approximately 70°C (160°F) - but do not allow the mixture to boil.
Remove from heat and stir in 240ml brandy.
Ladle into heatproof mugs and garnish with a cinnamon stick and fresh lemon peel if desired. Serve immediately.
Never let mulled wine boil - sustained high heat drives off the alcohol and flattens the delicate spice aromatics; keeping it just below a simmer at around 70°C preserves both warmth and complexity. Adding the brandy off-heat is equally important, as it protects the spirit's character from cooking away.
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