Abobora Manteiga com polenta de trigo sarraceno e limão em tempera

Name: Abobora Manteiga com polenta de trigo sarraceno e limão em tempera
Cuisine: European
Ingredients: 1.3 kg butternut squash; 3 tbsp olive oil; 25g butter unsalted; 300ml vegetable stock; 10g fresh oregano; 15 allspice; 6 cardamom pods; 6 laurel leaves; 6 thyme; zest of 1 orange; 8 garlic cloves; 30g buckwheat; 150ml full fat milk; 900ml vegetable stock; 10g fresh oregano; 1 laurel leaf; 1 tbsp thyme leaves; zest of 1/2 lemon; 60g unsalted butter; white pepper; 35g flour; 25g corn flour; 75ml soda; 1 tbsp oil; 1 lemon