Lamb Burgers with Feta Sauce and Spinach

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Handful walnut halves, about 3 to 4 tablespoons

3 tablespoons extra-virgin olive oil

1/2 small red onion, finely chopped

1/3 cup whole milk

2/3 cup feta crumbles

1 tablespoon freshly chopped marjoram or oregano, or 1 teaspoon dried

Few sprigs mint, leaves chopped

Salt and freshly ground black pepper

1 1/2 pounds ground lamb

1 teaspoon paprika or smoked paprika

A couple pinches ground cinnamon

1 clove garlic, crushed

2 bunches farm spinach leaves, stemmed, washed and dried

Nutmeg, freshly grated

Ciabatta rolls or sliced crusty bread, toasted