More recently I have grown similar things in a similar way, and I have definitely eaten the results. Mustard and Cress and other "Microgreens" can be used as a healthy, nutritious and delectable addition to any salad; as a sandwich ingredient (cress and hard-boiled egg is a traditional British favourite); or as a garnish for practically any meat, fish or vegetarian dish. It is alleged that seedlings harvested as Microgreens are exceptionally high in nutrients; on a weight-for-weight basis they are probably about the most nutrient-efficient foods you can get.
You can use lots of different types of seed, not just Mustard and Cress. Rocket (Aragula) works well, as does Basil, Broccoli and indeed practically any member of the brassica family. Using seeds this way could be expensive, when you consider that you can buy a pack of "Cress" [normally Rape] from the supermarket for about 25p, so you should perhaps try to find ways in which to be more economical. You can often buy suitable seeds in much larger packs than those which you would normally get if you were going to grow the plants conventionally. For instance this 120g (4.23oz) pack of Cress seeds from Dobies, and this 30g pack of Rocket from Johnsons (It is actually an Italian product re-packaged for the UK market).
This is how I grow mine:
Line an old margarine tub with a couple of layers of kitchen paper. You could also use cotton wool, or even compost.
Moisten the paper, without making it too wet.
Sprinkle the seeds onto the moist paper, quite thickly.
In the next picture you can see that little white shoots have emerged from the seeds. My cress germinated slightly quicker than the rocket.
From this point onwards, carefully rinse the tub of seed(ling)s once a day in lukewarm water.
After rinsing, ensure that the kitchen paper is moist but not wet.
The seedlings will grow very rapidly, and will be ready to eat within about a week.
|6 days after sowing|
|6 days after sowing|
When the seedlings are about 2 inches (5cm) tall, harvest then by cutting them off close to their bases with a pair of scissors.
|The finished item (Cress only the Rocket is a day or so behind...)|
You may end up with a few of the brown seed husks in amongst the sprouts, but I wouldn't worry about them -- just remember the added fibre they contribute!