The idea behind this is to combine any of the following vegetables, chopped rather thinly: Brussels sprouts, fennel, onions, leeks, mushrooms, cauliflower, cabbage, garlic or broccoli. Season them with olive oil and salt, toss them well in a large mixing bowl and then roast in a hot oven. You really can't go wrong.
Add the shallots, fennel, leek, onion, cabbage and olive oil to a large mixing bowl and toss well with salt, making sure everything is very evenly seasoned. Spread out on a sheet tray.
Roast, checking the vegetables every 15 minutes and moving them around using a spatula, until perfectly roasted, about 45 minutes total. Allow to cool for at least 15 minutes before using them.
Toast the bread slightly while the oven is hot and the vegetables are cooling. Spread the vegetables over the bread evenly, top the vegetables with the pea shoots and feta cheese and cut into serving-size pieces.
The roasted vegetables can be stored in the fridge for up to a week.