Don't bother purchasing a bottle of basil oil when it is this easy to make your own. Stirred into hot pasta or used as a dipping oil, basil oil adds a fresh herby element to any dish. To preserve the bright color and soften the grassy taste, blanch the basil before making the oil. To blanch, place basil leaves in boiling water for 10 seconds, then plunge them in an ice bath. Gently squeeze the leaves dry. Use pure olive oil, not extra virgin, which is really sharp and will overwhelm the basil, or you can also use a 50/50 blend of extra virgin and canola. Be careful not to process in the blender any longer than necessary; if it gets overheated the oil may take on a rancid flavor. Once processed, drain the solids, and store the oil for up to three days. If you don't grow your own basil, purchase the freshest you can find at the market. Snip the stems and keep the basil in a glass of water until you are ready to use.