The 57-year-old, who has been in the industry for almost three decades, admits in the foreword that she is neither a "professional" nor a "chef".
And speaking on BBC1's The One Show last night, Miss Lawson said: "I don't have technique." Her book, At My Table, which went on sale yesterday, also includes a detailed recipe for "garlic and parmesan mash".
Although she says, as a rule, she is "not one for flavouring mashed potatoes", she dedicates four pages to the recipe, and admits she has a "dedicated electric potato-mashing tool".
The mother of two has been posting taster recipes on her website in the run-up to the launch of the book, which has been criticised by fans for being too simple.
Commenting on a yellow spaghetti recipe with no sauce, one wrote: "Oh dear Nigella, I loved you back in the day but things seem so hit-and-miss now." Another wrote: "Boring! You might as well grab a packet of noodles from the supermarket.
How about some onions and mushrooms? Something is better than nothing."
Miss Lawson was widely mocked in 2015 for kicking off a cookery series by explaining how to make avocado on toast.
Writing about the recipes in At My Table, she admitted the bulk are very simple.
She said: "It doesn't require technique, dexterity or expertise, none of which I lay claim to.
Life is complicated, cooking doesn't have to be. It doesn't matter how many cookery books I write, I will never be a professional."
