Prepare the Mold and Cook Beetroot: Line a loaf tin (20cm x 9cm) with clingfilm and brush with olive oil. Boil beetroot in salted water for 40–50 minutes until tender, then cool.
Make the Cheese Filling: Mix goat’s cheese, soft cheese, chopped oregano, thyme, chives, salt, and pepper. Cover and chill.
Slice the Beetroot: Peel the beetroot by rubbing off the skin (wear gloves) and slice thinly with a mandoline or sharp knife.
Layer the Terrine: Add overlapping beetroot slices to the tin, trim as needed, then spread a thin cheese layer. Repeat until all ingredients are used, finishing with beetroot.
Press and Chill: Cover with clingfilm, weigh down with tins, and chill overnight.
Make the Garnish: Toast nuts with sugar in a pan until caramelized, then fry sage and oregano leaves in oil until crisp.
Serve: Unmold the terrine, top with nuts and herbs, and slice. Serve with toast and salad if desired