Toast keto seed bread slices until golden and crisp.
Whip ricotta with lemon zest and juice. Season with salt. Set aside.
Make beurre noisette: melt butter in small pan over medium heat. Swirl constantly until it turns golden-amber and smells of hazelnuts (3–4 min). Add thyme sprigs — it will sizzle. Remove from heat.
Spread whipped ricotta generously on toasted bread.
Arrange avocado on top. Season with fleur de sel.
Drizzle warm beurre noisette over avocado.
Finish with crushed pink peppercorns and micro herbs. Serve immediately.