^No point using nice ingredients in a mojito if you aren't gonna make it right. I evangelize about this recipe because after having one, I could never make it any other way.
Take half a large lime. Quarter that half. Put in the bottom of the glass. Add a bunch of mint leaves. Add granulated sugar, I use a teaspoon or so. Muddle that all together- the sugar really grinds up the mint quite nicely, and it then gets dissolved in the lime juice quite nicely. The husks of the lime add various oils that add a different, and good, complexity to the drink. Like garnishing with a twist, but better. Add crushed or cracked ice, until the glass is nearly full. Add a shot of rum. White is fine if you have a good one, I prefer the additional depth an aged rum gives. Add seltzer to top it off, you shouldn't need a whole lot. Stir, drink.