When I was putting myself to work on "Lemon slash" I was working on commercial visualizations and because of lack of time - I didn't have too much free time. One evening I decided to make something else to relax. The idea was to make something small, but very detailed and unusual in just one evening. A slashed fruit was a good idea.
First of all I had to gather some references. The main objective here is to find an image with the main shape of a lemon, the cross section and some images showing various parts of it. Try always to select a good reference to get a realistic, but "catchy" shape of the upcoming model.
First of all I started to make a whole lemon, which I would slash later. So after putting on a plane my image of the main shape of a lemon, I started to draw a smooth line along the border so the shape reminds the one from the reference. There's no need to draw along the whole border - simply just draw half of it and use lathe modification to turn it around obtaining that way the lemon shape. Now it's very important to focus on the shape. For my taste, the obtained shape was very stumpy, so I needed to scale it a little.