Southern-Style Baked Banana Pudding

Ingredients

• 4 large eggs
• 1/2 cup white sugar
• 1/4 teaspoon salt
• 1/3 cup all-purpose flour
• 2 cups milk
• 1/2 teaspoon vanilla extract
• 1 tablespoon banana liqueur (optional)
• 1 tablespoon cold butter
• 3 very ripe bananas, or more to taste, sliced
• 1 1/2 teaspoons freshly squeezed lemon juice
• 1 (12 ounce) package miniature vanilla wafers
• 1/8 teaspoon cream of tartar
• 2 tablespoons white sugar