Mix together evaporated milk, sugar, flour, and salt in a medium-sized bowl until a uniform mixture is formed.
Heat the mixture in a heavy saucepan over medium-high heat on the stovetop.
Using the same bowl, beat together the egg yolks and half & half, then slowly pour into the warm evaporated milk mixture.
Continuously stir for 10-15 minutes, allowing the flour to cook and the custard to thicken. Once removed from heat, add 2 tablespoons of butter and 1 tablespoon of vanilla extract to the mixture. Let it cool.
Arrange a layer of vanilla wafers on the bottom of a 7x11 inch oven-safe dish. Next, arrange sliced bananas on top, followed by an equal amount of the custard. Repeat this layering, ending with the custard.
Beat the 6 reserved egg whites with vanilla extract, cream of tartar, and granulated sugar until stiff peaks form.
Spread the meringue over the banana pudding and set the oven to broil, toasting the top until it is golden.
Preheat the oven to broil and use this setting to brown the top until it has a golden color.
For added presentation, consider adorning the edges with traditional vanilla wafers.
Store in the refrigerator until it's time to enjoy.