Naturally mature fresh walnuts, the shell network is dark brown, the protruding surface is yellow-white, the shell has many and light patterns, and smells fresh, if it is all white or dark. It doesn't matter, don't choose it.

Pecan fruits with large and pointed heads are the best. The color of the shell is slightly yellow and the overall color is uniform. Take it in your hand and shake it gently a few times. If it doesn't make any noise, it's usually a healthy baby among the walnuts. Pecans are split, so you can smell the pulp directly. If the pecan fruit itself has a fragrant pulp, it is good. If it has a musty smell or an unusual taste, then don’t buy it.

High-quality almonds have a plump shape, plump kernels, rough skin, and a brownish-yellow color through the salt-and-pepper processing. Grab a handful of almonds and make a squeaking sound, and the ones that are particularly dry are good ones; if they are damp, greasy, or stuck together, don’t buy them.

Compared with other nuts, the selection of macadamia nuts is relatively simple, because almost every macadamia nut is opened by a professional machine. You only need to select large nuts with plump kernels and nut colors ranging from milky white to light brown. . In order to make it easier to buy home and eat, it is best to buy macadamia nuts with a longer opening. Don’t buy too much at a time, and only buy after you’ve finished eating to avoid staleness or spoilage.