Pesto is a sauce originating in Genoa in northern Italy. The word comes from the Latin pesta, meaning to pound or crush, the same root for the English words pestle and paste.

Pesto alla Genovese is made with 5 ingredients: fresh basil, garlic, pine nuts, grated hard cheese and olive oil. The cheese is parmigiano reggiano or sometimes pecorino romano. Sometimes parsley is added. Pesto is best used raw, or tossed with hot pasta yet not cooked itself. Cooking (or drying) destroys much of the aromatic quality of basil. Although basil is widely used in cooked dishes, when used raw, the flavor and aroma are much brighter, almost anise-like. Pesto is used as a sauce in lasagne, on pizza, and in other cooked dishes, but it’s best at room temperature.
Pesto alla Genovese
2 c packed basil leaves
5 large garlic cloves
1/2 c pine nuts, toasted
1 c grated parmesan
3/8 c olive oil
You can use a mortar and pestle or a food processor. A blender won’t work well with this thick of a paste. A mortar and pestle will yield a pesto with a crushed, more interesting texture, as you can see in the picture above, rather than a smoother consistency. Anyway, employing either method, you start with the basil and garlic, then after those are pretty mashed up, add the pine nuts, mash, then the cheese, mash, and finally the oil. Obviously, you don’t want to put the oil in first if using the mortar and pestle, because it will just slop around. But even with a processor, it’s best to add it last; if it goes in with the basil and garlic, it will emulsify quickly, then by the time you add the cheese and nuts, the paste will be thicker and more glue-like. Instead, start without the oil, and keep stopping the processor frequently to scrape down the sides with a rubber spatula. When the oil is added at the end, the sauce should be almost creamy.
The salty, hard cheese will probably provide enough salt, especially if paired with pasta cooked in heavily-salted water. But you can add a little salt to taste. Also, a little fresh cracked, toasted pepper is nice. Chile-heads might want to add some hot chiles, even though that would be entirely not traditional; if you must add chiles, I’d recommend using fresh green, hot chiles, such as serranos, rather than dried red chiles or red prepared sauces.
It’s important to toast the pine nuts. This gives them a deeper, more intense flavor. As a rule, I think nuts should always be toasted, even if they are going to be used in a cooked item, such as chocolate chip cookies. Walnuts are a good variation, or pine nuts and walnuts ½ & ½. Other common variations are walnuts, almonds or cashews. All toasted.
Fresh lemon slices are a nice garnish for pesto pasta. Some people add a little lemon juice to the pesto, instead. You could add the juice of a whole lemon to the above standard recipe. You might then need to add a little more salt to balance. This is not a good variation if you plan on storing the pesto, as the acid will discolor the basil (1 day) and eventually change its flavor as it pickles(2-3 days).
Anchovies are an excellent addition. The best pesto I’ve ever had was made with anchovies, and had been allowed to mature at room temperature for several hours before serving. Three or four fillets should be enough for the above recipe.
Parsley is a traditional addition. Italian flatleaf is much preferred, because the flavor is different; flatleaf has a flavor slightly similar to orange zest.

Pesto rosso, red pesto, is Sicilian, and is made with sun-dried tomatoes, only a small amount of basil, almonds instead of pine nuts, plus hard cheese and olive oil. Here’s a fantastic version of pesto rosso that also includes oil-cured black olives, fresh rosemary, and a bit of balsamic vinegar. This pesto can change your life, and it improves everything it is spread upon.
Pesto Rosso
10 whole sundried tomatoes, packed in oil
5 cloves garlic
about 20 oil-cured black olives, pitted
1/2 c almonds, toasted
1/4 c chopped, packed fresh rosemary
2 tsp sugar or honey
1/2 tsp dried red chile flakes
1 tsp freshly toasted, crushed black pepper
1/2 c olive oil
2 tsp balsamic vinegar, or sherry vinegar
Puree all, add oil and vinegar last. Although this pesto rosso includes vinegar, it stores better than basil pesto, and even cooks up better. A nice variation here is to substitute part or all of the sun-dried tomatoes for roasted red peppers.

An amazing quick sauce for pasta (or for dipping bread) can be made by first caramelizing a mess of onions, deglazing with wine, then adding some pesto rosso, and finishing with a couple pats of cold butter.
Nowadays, there are a thousand new, trendy pesto recipes to be found. It’s easy to make your own. You can follow a basic template, and then branch out from there. Start with five ingredients. You’ll want:
1) A fresh herb: basil, rosemary, tarragon, oregano, mint, cilantro, dill, thyme, etc., etc.
2) A member of the Allium (onion) family: garlic, shallots, leeks, scallions, red onions, sweet onions, elephant garlic, smoked onions, smoked garlic, roasted onions, roasted garlic, etc.
3) Nuts: pine nuts, walnuts, almonds, cashews, pecans, hazelnuts, macadamias, peanuts, sunflower seeds, pumpkin seeds, sesame, etc.
4) Cheese: parmesan, romano, dry jack, sap sago, asiago, myzithra, cotija, Jarlsberg, fontina, Gorgonzola, chevre, cream cheese, etc.
5) Oil: I would recommend olive oil for most combinations. However, if working with Asian flavors, olive oil may seem cloying, so I’d recommend peanut, soybean, canola or sesame (and maybe leave the cheese out).
- Derrick Snyder