We have a lot of family allergies.

TBH, I started DS off with fruit and veg only, so he didn't have a full meal, just the fruit or veg part of the meal. Then I introduced carbs, then meats. So not strict BLS, but it worked well for us.

Example - at 5mo I'd cook brocolli and pasta bake, keep some broccoli aside for DS. We'd have sandwiches and an apple, DS would have an apple. At 7mo DS would have brocolli AND pasta on his dish, or bread AND apple. Later he'd have meat on there too. And a choice of veg with the meat. Just after 10m he was having a scaled-down adult meal (only because it was Christmas and DS was nicking the turkey and sausages from DH's plate!). BUT DS loves his food and started BLS himself at 5m. If your DS isn't interested you may have to do something else.

I still have't introduced allergens, other than cow's milk (DS is now on goat's due to allergies). I am having his allergy tested next month to find out which, if any, parental allergens we can introduce. Not that we'd actually introduce penicillin to his daily diet, but maybe brazil nuts.

I also would cook for four every night when DS was 1 and then I'd have enough food to pop in the freezer so DS could have the same again! Although he hated that and liked variety, so that didn't work too well. And I'm still cooking for 4, but DS and DH generally eat the extra portion between them. So no leftovers!