Remove the leaves from the stalks of the chard and chop the leaves into small pieces. Snow the stalks into small diamonds, dice the onions and also chop the tomatoes. Put everything aside.
Heat the olive oil in a pan. As soon as it is hot enough, sweat the onion until translucent. Then crumble the minced meat in the pan and sear it. Then add the chard stalks and fry well. Deglaze everything with the vegetable stock and red wine. Braise for 15 - 20 minutes over medium heat with the lid closed.
Then add the chard leaves and tomatoes and cook for another 5 minutes. Season everything with salt, pepper and the Italian herbs to taste. Then crumble the feta cheese over the minced meat pan. Heat for 1 - 2 minutes and stir well.
This goes well with rice or baguette (but then the dish is no longer low carb).