Here are a few I found...

Honeycomb Toffee (aka Sponge Candy)

Ari Rapkin

1 lb granulated sugar
1/2 pint water
4 Tbsp vinegar (clear)
3 Tbsp golden syrup
1/2 tsp baking soda, sifted
12 oz. chocolate chips
2 Tbsp vegetable shortening
1 (1 oz. square unsweetened baking chocolate

Butter or oil an 8" square tin; set aside.

Put sugar, vinegar, syrup, and water in a heavy saucepan (cast iron if you have
it). Be careful that your pot is big
enough, because sugar has a tendency to boil over. Gently heat the mixture,
stirring with a wooden spoon, until
sugar has dissolved & syrup has melted. Bring to a boil, cover & boil for 3
minutes, then uncover and boil until
temperature reaches 285-degrees F on a candy thermometer.

Remove from heat & stir in the baking soda, mixing well to allow bubbles to
subside a little. CAUTION: once
you add the baking soda the mixture WILL bubble up quite a bit. Again, make sure
your pot is large enough or it
will bubble over the sides. The baking soda is what gives it its light airy
texture.

Pour into oiled tin & leave until just beginning to set. Mark into squares with
a lightly oiled knife. Leave to set
completely. Cut or break into pieces.

Combine chocolate chips, shortening & baking chocolate in 2-quart glass micro-
proof bowl. Microwave on
HIGH 2 minutes. Using wooden spoon, stir through to melt.

Dip honeycomb pieces into chocolate, covering completely. Let cool on waxed
paper. Wrap individually in
waxed paper, twisting the ends together, and store in an airtight container.

Sponge Toffee

Ingredients
1 cup sugar
1 cup dark corn syrup
1 tablespoon vinegar
1 tablespoon baking soda
Instructions
Combine sugar, syrup, and vinegar in a large heavy
saucepan
Stir until dissolved, then cook without stirring until
the crack stage is reached (300 on a candy
thermometer)
Remove from heat and quickly stir in baking soda
It will bubble furiously but be sure to stir well so
that soda is completely dissolved
Pour into a buttered 9x9 inch pan, do not spread as
the candy will spread itself and foam up more in the
pan.
Cool and break into pieces.
Optional: If desired candy pieces may be dipped into
melted chocolate.