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For dry measures,

1 British teaspoon = 2 U.S teaspoon

1 British quart = 1 U.S quart

For liquid measures,

1 British teaspoon = 1 U.S teaspoon

The conversion factors can be used to convert the physical quantity from one unit to another unit. Using the given conversion factors, find the amount of stock, rice, nettle tops, and salt required in the recipe.

The amount of stock required in the recipe is,

$$\begin{gathered} \mathrm{Amount}\mathrm{of}\mathrm{stock}=1\mathrm{breakfast}\mathrm{cup}+1\mathrm{teacup}+6\mathrm{tablespoons}+1\mathrm{dessert}\mathrm{spoon}...\left(\mathrm{i}\right) \\ 1\mathrm{breakfast}\mathrm{cup}=2\mathrm{tea}\mathrm{cup}脳8\mathrm{table}\mathrm{spoons}脳2\mathrm{dessert}\mathrm{spoon}脳2\mathrm{tea}\mathrm{spoon} \\ 1\mathrm{tea}\mathrm{cup}=8\mathrm{table}\mathrm{spoons}脳2\mathrm{dessert}\mathrm{spoon}脳2\mathrm{tea}\mathrm{spoon} \\ 6\mathrm{tablespoons}=2\mathrm{dessert}\mathrm{spoon}脳2\mathrm{tea}\mathrm{spoon} \\ 1\mathrm{dessert}\mathrm{spoon}=2\mathrm{tea}\mathrm{spoon} \end{gathered}$$

Substituting the all above quantities in equation (i).

$$\begin{gathered} \mathrm{Amount}\mathrm{of}\mathrm{stock}=\left[\left(2\right)\left(8\right)\left(2\right)\left(2\right)+\left(8\right)\left(2\right)\left(2\right)+6\left(2\right)\left(2\right)+1\left(2\right)\right] \\ =122\mathrm{U}.\mathrm{S}.\mathrm{teaspoons} \end{gathered}$$

Thus, the amount of stock is $122\mathrm{U}.\mathrm{S}.\mathrm{teaspoons}.$

The amount of nettle tops required in the recipe is,

$0.5\mathrm{British}\mathrm{quart}=0.5\mathrm{U}.\mathrm{S}\mathrm{quart}.$

The amount of rice required in the recipe is

$$\begin{gathered} 1tablespoon=2dessertspoons=4taspoons \\ 1U.Steaspoons=1Britishteaspoon \\ 1tablespoon=4teaspoon \end{gathered}$$

Thus, the amount of rice required is $4\mathrm{U}.\mathrm{S}.\mathrm{teaspoon}$.

The amount of salt required in the recipe is,

$1\mathrm{saltspoon}=\frac{1}{2}\mathrm{teaspoon}.$

Thus, the amount of salt required is $\frac{1}{2}\mathrm{U}.\mathrm{S}.\mathrm{teaspoon}.$