The tomato test, or tomato slicing test, is a handy way to see if your knives could do with sharpening. The idea is that a properly sharpened blade should slice through the taut skin of a tomato with minimal pressure.

Somewhat counterintuitively, most cooks seem to agree that sharp knives reduce the risk of accidents as you don't have to push down as hard as with blunt knives.

To do the tomato slicing test: Place a tomato on a board and gently run the knife over the top surface. A sharp blade will glide through the tomato skin, cutting it precisely all the way down. You shouldn't need to apply any pressure if the knife has weight. If you need to push down to pierce the skin, it could be time to sharpen.

Cutting the top off the tomato first allows it to sit stably on its end, so you don't have to hold it.

Alternatively, you could use a serrated knife which is handy for foods with a hard outside and a soft inside.

The sharper the knife, the less mess you'll make and the easier you can ghost cook.

The tomato test

Traditionally, stocks have the flavour and gelatinous collagen-y thickness that comes from cooking bones. Broth was cooked not with bones but with the meat itself. While a jus is a sauce made from the pan drippings, usually from a roast. This simple distinction I learned from Thomas Keller.

Now, you can also have vegetable stock, so some other useful distinctions between stock and broth include that, generally, stock is intended to be used in the preparation of another dish rather than eaten directly like broth. As such, you would more likely use whole vegetables in stock to impart the flavour, but still scoop them out afterwards, while a broth would have cut vegetables ready to eat in the broth itself.

Stock, Broth, Jus

Before getting started in your kitchen both Thomas Keller and Gordon Ramsay picked out this safety tip to stop your chopping board slipping while cutting. Just lightly wet a piece of kitchen towel or a tea towel and lay it flat between the surface and your chopping board. Hey presto! No slipping while cutting so all your fingers stay intact even with those tricky butternut squash.

Stop chopping board slip

That classic thing: tomatoes are really a fruit — well, a whole lot of other vegetables are technically fruit too. I do find this way of thinking of it helpful:

Fruit — ovaries developed from the flowering parts containing seeds. They’re basically what grows where the flower was.

Vegetable — other edible parts of a plant. So basically, anything else, with a handy list being: leaves, roots, stems and flowers.

So this makes tons of other common vegetables actually fruit, including peas, avocadoes, cucumbers, eggplants, bell peppers and more. And corn and raspberries are still rather complicated.

Some other fruit and veg sketchplanations:

what’s the difference between mandarins, clementines, satsumas and tangerines?

Sketchplanations tagged with vegetables