Building Plant-Based Umami: The Mushroom Ragù Approach. Creating deeply satisfying savoury depth without meat or cheese requires layering umami from multiple sources. Gemma's mushroom ragù demonstrates the principle: two varieties of mushroom (portobello for earthy depth, chestnut for sweetness) are cooked hard over high heat without stirring for the first few minutes, allowing the Maillard reaction to develop deep colour and concentrated flavour before any liquid is added. The pan must be dry before deglazing — wet, steamed mushrooms taste flat. Tomato purée cooked for a minute adds another layer of glutamate. Wine deglazes the fond (the caramelised bits stuck to the pan) and adds acidity. The quiet hero is a tablespoon of soy sauce or tamari, which bridges the umami gap left by absent parmesan and ties the earthy mushroom flavours together. The ragù then simmers for 10–15 minutes until thick and glossy. Marcus praised it as having real body and earthiness. The combination of these techniques — proper browning, fond recovery, and strategic seasoning — is what makes plant-based cooking genuinely satisfying rather than simply meat-free.