Preheat oven to 150°C. Roast walnuts for 10-15 minutes until toasted and fragrant. Make sure to stir the nuts every five minutes.
Heat up a generous amount (approx. 1tbs) of olive oil in a pan. Sauté Swiss Chard for five minutes, the add garlic and sauté for another fine minutes while stirring frequently. You do not want to burn the garlic and the Swiss chard, you just want to cook it. So make sure to keep the temperature fairly low.
Add sautéed Swiss chard and garlic into a food processor with the rest of the ingredients and process until smooth.
Spread onto a slice of freshly baked bread.* If you cannot find Sumac you can omit it and sub cumin or paprika for it. This will of course change the flavour but it will also go nicely with the rest of the ingredients.
Recipe by at https://fannythefoodie.com/2019/04/17/the-green-breakfast-tartine-ad/