Stewed Eggs Ingredients Skins from a dozen yellow onions (brown skins) 8 large eggs 1 Tbsp olive oil 2 Tbsp ground coffee or instant coffee 1 tsp Kosher salt 1 tsp ground black pepper Preparation Place the onion skins in the bottom of a slow cooker (using a liner is recommended). Set the eggs gently in the onion skins. Drizzle the olive oil on top of the eggs. Scatter the coffee grounds over the eggs, then sprinkle with the salt and pepper, and add water to just cover. Cover and cook on low for at least 10 hours. Wipe off the eggs and serve either warm or cold. Notes A slow cooker liner makes for much easier cleanup.