1. 1) Drain the corn. Peel and finely slice the onion.
2. In a saucepan, heat the butter over medium heat.
3. Melt the onion in the butter for 3 minutes without letting it brown, stirring often.
4. Add 60cl of hot water and the chicken stock. Mix well, bring to a simmer. Add the corn. Let it simmer for 5 minutes.
5. 2) Blend the contents of the saucepan, then strain it through a fine sieve. Return it to the saucepan over low heat. Dissolve the cornstarch in 2 tablespoons of water. Pour it into the saucepan along with the cream, lemon juice, and nutmeg. Season with pepper.
6. 3) Stir for about 2 minutes, until it simmers. Remove from heat, adjust the seasoning, and serve hot or warm.