Ingredients4 cloves of garlic
120 gr (4 oz) Genovese basil
50 gr (1.8 oz) pine nuts
1 cup of grounded Pecorino Sardo
about 1 cup extra virgin olive oil
1 tbs coarse sea salt
PreparationGround up in a blender the salt, the garlic cloves cut in slices, the nuts, the cheese, and the oil.
When the mixture will appear homogeneous add the basil leaves and ground them using the blender in the pulse mode, keeping the thing as short as possible. During this phase, add some more oil if the mixture if it is too dense. The final product should be homogeneous but still quite dense.
Pesto can be stored in the fridge for one or two week or can be frozen: put it in small air-tight containers, paying attention to cover completely the surface of the pesto with a thin layer of oil.
How to keep Pesto to become brownPesto preparation is simple, provided you follow some tips to avoid it to become brownish.
Basil leaves can easily turn into an unpleasant dark color due to the oxidation of their chlorophyll. This will not affect the taste of pesto but it will definitely spoil its appealing look.
Oxidation is triggered by temperature below zero (Celsius), metallic tools, and high temperature.
As a consequence DO NOT FREEZE basil and harvest it from you garden before the first frost. Furthermore pesto has NEVER TO BE COOKED.
In the old times pesto was prepared by using marble mortar and a wooden pestle. Nowadays no one take this trouble besides few old grannies in Liguria. In the majority of the Italian kitchens pesto is prepared by using a food processor. The risk of oxidation catalyzed by the metallic blades and the heating inherent in the use of the food processor can be minimized by some
forethought:
1) Keep the basil leaves in the fridge until the last minute. If you harvested them from your own garden, allow some time in the fridge before preparing the sauce. Add them as the last ingredient, after cheese, garlic and salt are blended together. This way you will reduces greatly the processing time for the leaves.
2) Use only extra virgin olive oil: all common vegetables oils are industrial products obtained after heavy chemical processing. Extra virgin olive oil is instead a natural product, obtained simply by cold crushing of olives. As a consequence it is a complex mixture of many different substances, some of which, like tocopherols and carotenoids, have antioxidant properties.
3) Some people add lemon juice. The ascorbic acid (Vitamin C) contained in lemons is a very effective antioxidant to use in the kitchen. Although very useful when it comes to avoid apples slices or artichokes to darken, its flavor doesn't really fit in the classical pesto recipe. If you want to try it, use at least the prepared one (the one in the silly lemon shaped yellow plastic bottles): it tastes of nothing but acidic, and it will probably not affect the final flavor of the sauce... I never used it, though!
4) store it covered with oil to avoid any contact with air and pack it very tight in the jar, avoiding any empty bubble (that would be full of air..)
More about the ingredientsIn Italy, where food is a serious stuff and bureaucracy controls everything, we have set of rules (
disciplinari) about how to prepare specific cheeses, wines, or dishes. These sets of rules define for example the geographical area form which the ingredients can be collected or what you can or cannot put in the recipe in order to have a
DOC (
Denominazione di Origine Controllata, controlled denomination or origin) product. Only if you follow the rules you can use the registered trademark (like
Parmigiano Reggiano or
Pesto alla Genovese, etc.).
According to the rule applying to the traditional
Pesto alla Genovese, only the ingredients I listed above should be used. Nevertheless there are several substitutions that can be made without significantly altering the final result
1) Coarse sea salt: this is not a big deal in Italy. Unrefined coarse see salt, looking like light-grey big crystal, are inexpensive and extremely common. Unrefined sea salt is an excellent source of Iodine and oligo-elements. The cheapest one I have found so far is the one from Trader Joe's, that is nevertheless sold at about 4 dollars for 400 grams, as opposed to 1 euro for 1 kilogram in Italy... kasher salt can be a good and cheapest alternative. The coarse texture of the crystals helps the grounding. The amount of salt is influenced by the cheese: if you are going to use only Pecorino romano, that is normally way more salted the Parmisan, you will have to consequently reduce the salt.
2) Extra virgin oil: there is no point in using fancy and expensive e. v. olive oil, here. Its taste would be covered by the garlic... I keep the very nice olive oil I am able to bring back from Italy for raw use on salads. For every day use, and especially for cooking, I buy 5 liters tins from Whole Food (365, Italian, about 25 dollars) that is so far the best one I have found in terms of quality/price ratio. When buying olive oil be aware of the fundamental difference between
extra virgin olive oil and
virgin olive oil or simply
olive oil. You should buy only the first one: the Italian law is pretty strict and states that it can be obtained only from intact and very fresh olives collected directly from the trees. This way the olive's acidity (that is a measure of deterioraton of the raw material, due to the hydrolysis of triglycerides in glycerin and long chain organic acids) is extremely low.
Virgin olive oil and
olive oil (without any further adjectives), although still produced only by mechanical squeezing of the olives without any chemical processing, are obtained from olives collected from the ground. This fruits, laying on the soil for some days, have already started some fermentation and the oil obtained from them will be more acidic, startint to taste of rancid. If the oil is named
rectified or
sansa olive oil this means the acidity was so high that some chemical treatments with alkalin substances (like soda) were necessary to make it edible.
2)
Cheese: According to the above mentioned
disciplinare you should use only Pecorino Sardo. I personally use a 50:50 mix of Parmisan and Pecorino Romano.
3)
Nuts: although the traditional recipe call for pine nuts, it is really common to substitute half or even all of them with walnuts.
4)
Genovese Basil: this is a DOP product (protected origin denomination) that refers to basil grown only in the town Genoa, in Liguria (actually in a specific area of the town, the neighborhood of Pra'... we are so picky in Italy when it comes to food...). It has a distinctive delicate flavor, lacking that scent of mint that can be found in ordinary Italian basil. This characteristics though depend mainly form the
terroir so there is no point in buying the seeds and planting it in U.S., in my opinion. Just use sweet basil, preferably home grown.
You can make a lot of experiments, substituting basil with mint or
rucola (arugola), but that is different story...
tutta n'ata storia, as Pino Daniele would say...
http://www.youtube.com/watch?v=v1FI31fS62U
Which pasta?Traditionally pesto goes with a Ligurian long pasta called
trenette. Do not even try to look for them... Go with
bavette,
bucatini or
linguine. If you prefer short pasta,
fusilli and
farfalle will work.
Gnocchi di patate are a really good pick
.


For obscure reason
fusilli in U.S. are called
rotini: look at the pictures of the US box, on the left, and the EU one, on the right!
You can look on Wikipedia for some nice pictures of different pasta with their names:
http://en.wikipedia.org/wiki/pasta
Cooking the pasta for the PestoPrepare the salted water for the pasta keeping in mind that you are going to use a very salted sauce!
Once the pasta is cooked (al dente and using abundant water), keep a cup of the cooking water aside and drain the pasta. Put the pesto in a large bowl and add the cooking water you saved, little by little, to adjust the consistency of the sauce. Add the past and blend all together. Enjoy it!
TIP: pesto is a great ingredient to add to a bean's ZUPPA (soup)...