Heat the oven to 200C/400F.
Place the block of feta in a 20 cm / 8-inch baking dish. Drizzle with the olive oil and add a pinch of black pepper.
Bake for 12 to 15 minutes, until the feta is soft and warm through and the edges just start to turn golden. Give the dish a gentle shake, if the cheese wobbles slightly but holds its shape, it's ready.
While the feta bakes, toast the sesame seeds in a small dry skillet over medium heat for 2 to 3 minutes, stirring often, until golden and fragrant. Watch closely, they burn fast.
Remove the feta from the oven and drizzle the honey over the top while it's still hot, so it melts into the cheese.
Sprinkle the toasted sesame seeds, chili flakes, thyme leaves, and lemon zest over the top.
Let it sit for 2 to 3 minutes so the flavors settle, then serve warm with crusty bread for scooping.