Every day they have a vegetable platter for their tea of about 3 different veg at a time - mainly leafy greens and a small portion of herbs and root vegetables. Could be any of these - broccoli, cauliflower, spring greens, savoy cabbage, kale, mixed packet salad, wild rocket, parsley, basil, corriander, carrot, parsnip, brussle sprouts, celery, spinach.
And when it starts growing again, they will have a handful of grass and dandelion leaves instead of the leafy greens. And the occasional leafy apple or hawthorn branch which they adore.