Chop the tomatoes or add them to a food processor. I used a food processor because it's just easier and quicker and I'm lazy.Put them in a bowl. Do this with the cucumber and onion as well, making sure to separately chop each in the food processor.I processed the onion and dill together.Once it's all in a bowl, add the salt and let it sit for a minute to draw out the liquid.Pack into an air tight jar. You don't want the veggies to be above the water line, air will create mold.A great way to get around this is pack it into a mason jar with some room at the top, the pour a few tbsp of olive oil on top until it's covered. This will keep the air from getting in and prevent mold from forming!Let it ferment in your cupboard for two days.Eat!